Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

gjhfdfg Group Title

Evaluating expressions,

  • one year ago
  • one year ago

  • This Question is Closed
  1. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Easiest problem ever, but I forgot how to do them, |dw:1361117139126:dw| Can someone show me step by step how to solve this or create a problem giving me an example? Thanks.!

    • one year ago
  2. muhammad9t5 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    \[1-\frac{ 694 }{ 896 }\] do you mean?

    • one year ago
  3. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    No, its P

    • one year ago
  4. muhammad9t5 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    then p4 do you mean its power or 4 is multiplied?

    • one year ago
  5. muhammad9t5 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    like p4 or \[p^4\]

    • one year ago
  6. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I have no idea... It just says 6P4,

    • one year ago
  7. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Noo, its not that, I'll take a screenshot

    • one year ago
  8. muhammad9t5 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ok... i am waiting for screenshot.

    • one year ago
  9. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    This is the problem,

    • one year ago
    1 Attachment
  10. muhammad9t5 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    this is Permutation.

    • one year ago
  11. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    ohh..its permutation!

    • one year ago
  12. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I also have this problem that includes a exclamation mark, |dw:1361117585779:dw| Do you know what its for?

    • one year ago
  13. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    & whats permutation? O_O I have never ever heard of that

    • one year ago
  14. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \(!\) means a factorial.

    • one year ago
  15. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \(n!= n(n-1)(n-2).......3.2.1\) when n is a whole number. like for example 5! = 5*4*3*2*1 = 120

    • one year ago
  16. muhammad9t5 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    answer is 1 it means that you need to expand 6 as 4 times and 8 as 6 times.

    • one year ago
  17. muhammad9t5 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    1/56

    • one year ago
  18. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    before getting to permutation, you should know what a factorial ! is .

    • one year ago
  19. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    OH.! so I had something like 10! I would have to do 10*9*8*7*6*5*4*3*2*1= etc..?

    • one year ago
  20. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yes, thats correct.

    • one year ago
  21. muhammad9t5 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    6P4= 6*5*4*3 and 8P6= 8*7*6*5*4*3

    • one year ago
  22. muhammad9t5 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yes you are correct.

    • one year ago
  23. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    do you want to know how to get that^ ?

    • one year ago
  24. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I feel like I've done this stuff in 8th grade but had forgotten how to do some of this. These questions are for my pre-cal class & I found it odd that I had a probability question in there

    • one year ago
  25. muhammad9t5 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yes.

    • one year ago
  26. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \(\huge ^nP_r = \dfrac{n!}{(n-r)!}\)

    • one year ago
  27. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    So basically I had to do the factorial (!) to the 6P & 8P?

    • one year ago
  28. muhammad9t5 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yes.

    • one year ago
  29. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \(\huge ^nP_r = \dfrac{n!}{(n-r)!} \\\huge ^6P_4 = \dfrac{6!}{(2)!} \\ \huge 8P_6 = \dfrac{8!}{(2)!}\)

    • one year ago
  30. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Everything on the left side of the = is confusing to me

    • one year ago
  31. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    in the formula of nPr ? its just a formula, so for 6P4, i plugged in n=6 and r=4 in the standard formula.

    • one year ago
  32. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    How would you know which ones to plug in? Because in one you have 6P4 & in the next 8P6, I don't get how you go to that?

    • one year ago
  33. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    n is before P , r is after P . in 6P4 , 6 is before P (so, n=6) and 4 is after P (so r=4) does this makes sense ?

    • one year ago
  34. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Ah, it does now.! :-) Thanks you guys both for explaining this to me.!

    • one year ago
  35. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Thank me when you get to correct answer.

    • one year ago
  36. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    What do you mean?

    • one year ago
  37. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    i meant to ask you, whether you could now figure out the answer of that question...

    • one year ago
  38. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I do the factorial, 8*7*6*5*4*3*2*1, I thought?

    • one year ago
  39. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    & then divide my answer by 2?

    • one year ago
  40. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    thats for 8P2

    • one year ago
  41. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Then I'm lost again,

    • one year ago
  42. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    i never said you are wrong. its just not the final answer.

    • one year ago
  43. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Then I do the same with the 6

    • one year ago
  44. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    6P4 = 6*5*4*3 8P2= 8*7*6*5*4*3 Question asks, 1- 6P4/8P2 = 1- 6*5 / 8*7*6*5 = 1- 1/(8*7) ok ?

    • one year ago
  45. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Ah, I wasnt paying attention to the 1,

    • one year ago
  46. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Would I have to subtract the 1 from the 6 & start factoring 5?

    • one year ago
  47. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    no... first division operation is performed, so 6*5*4*3 will get cancelled from numerator and denominator, and what remains is just 1- 1/(8*7) which i've already shown.

    • one year ago
  48. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Thats confusing

    • one year ago
  49. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    ok, clear till this : 6P4 = 6*5*4*3 8P2= 8*7*6*5*4*3

    • one year ago
  50. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Got that...

    • one year ago
  51. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    now divide them 6P4/8P2 =.... ?

    • one year ago
  52. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I got 0.0178 etc... Thats not right..

    • one year ago
  53. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    keep it in fractions..

    • one year ago
  54. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I got 360 from 6*5*4*3 & 20160 from the factorial of 8.

    • one year ago
  55. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    How would I keep it in fractions?

    • one year ago
  56. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    you can also cancel out like this : |dw:1361120576575:dw| got that ?

    • one year ago
  57. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Ah, got it.! I wasnt thinking about canceling out

    • one year ago
  58. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    ask if any more doubts.

    • one year ago
  59. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    What happened to the 4 & 2?

    • one year ago
  60. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    i just realized i mistyped 8P6 (and have written 8P2 instead) 4 and 2 where ?

    • one year ago
  61. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    The 4 after the P and the 2 after the other P

    • one year ago
  62. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    oh, we used the formula, right ? 6-4 = 2, so 2! in the denominator 8-6= 2, so 2! in the denominator

    • one year ago
  63. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    OH.! Ok I get it.!

    • one year ago
  64. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    1/56 wasnt correct, could it be 55/56 by any chance?

    • one year ago
  65. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    ?? you forgot '1-...' again ? 1- 1/(7*8)= 1-1/56=(56-1)/56 = 55/56

    • one year ago
  66. gjhfdfg Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    *face palm* Thank you.

    • one year ago
  67. hartnn Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    welcome ^_^

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.