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

open_study1 Group Title

tHE NUMBER OF WAYS 3 DIGIT NUMBER odd number CAN BE FORMED BY 0,3,4,8,9 SO THAT THE NUMBER DOES NOT REPEAT

  • 2 years ago
  • 2 years ago

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

    \( \color{Black}{\Rightarrow {5p1} = 5! }\)

    • 2 years ago
  2. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Oops

    • 2 years ago
  3. goformit100 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    4*3*1

    • 2 years ago
  4. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    \( \color{Black}{\Rightarrow 5p3 = {5! \over 2!} }\)

    • 2 years ago
  5. goformit100 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1338570568852:dw|

    • 2 years ago
  6. LyraElizabethAdams Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Well, because you're looking for ways in which a number does not repeat, you're going to need to use permutation. So, you'd take the total numbers that you have (5), and "permut" that by the 3 choices of number that you need. So: 5P3 Hope this helps!! ;)

    • 2 years ago
  7. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    odd no. - so the last digit can be either 9 or 3 -> 2 ways. choose and arrange any 2 outta remaining 4 digits = 4P2 so no. of possible of possible nos. = 2 * 4P2

    • 2 years ago
  8. LyraElizabethAdams Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    This would give you a total of 60 non-repeating choices.

    • 2 years ago
  9. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    FOLKS! @ParthKohli and @LyraElizabethAdams - seems like you missed out that 'odd' word in the question - just like I did in the beginning.

    • 2 years ago
  10. LyraElizabethAdams Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    OH, MY GOODNESS - I just realized that myself! Thanks!

    • 2 years ago
  11. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    So there is a fixed value of the last digit.

    • 2 years ago
  12. LyraElizabethAdams Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    You'd need to make sure, then, that you only count the numbers for which 8 is not at the end - 8 is an even number and would make the number even.

    • 2 years ago
  13. LyraElizabethAdams Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    And 4.

    • 2 years ago
  14. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    3 * 2 * 2 = 6 * 2 = 12

    • 2 years ago
  15. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @goformit100 - that last one would be '2' - won't it?|dw:1338570736125:dw|

    • 2 years ago
  16. LyraElizabethAdams Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Ooops - and 0.

    • 2 years ago
  17. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Because there are 3 for the first, 2 for second, 2 for third, it'll be 3 * 2 * 2

    • 2 years ago
  18. open_study1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    @apoorvk u r correct can u explain that

    • 2 years ago
  19. goformit100 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @apoorvk BUt there is only one odd number; then last must be 2 na.

    • 2 years ago
  20. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Yeah so I am correct. 3 * 2 * 2

    • 2 years ago
  21. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I just told you - the last digit has to be odd for the whole no. to be odd. and you have two odd digits in the array - 3 and 9. so choosing any one of them = 2 ways. now the remaining two digits = i can use any 2 from the 4 digits now left in the array, so 4P2, or 4x3. so, ways of selecting the no. = 2 x (4x3) = 24

    • 2 years ago
  22. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    There are two digits according to me - '3' and '9' - if we are on earth that is. -_-

    • 2 years ago
  23. goformit100 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    oooo yes i mistaken, you were write, @apoorvk

    • 2 years ago
  24. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ^^*odd digits

    • 2 years ago
  25. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    But wait, there are 3 possibilites for the first because we don't have digits repeated. 2 for second. 2 for third.

    • 2 years ago
  26. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh ok

    • 2 years ago
  27. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Lol, no problem. ;)

    • 2 years ago
  28. FoolForMath Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    It should be \(2\times 3\times 3 =12\)

    • 2 years ago
  29. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    3 * 2 * 2 is the answer :/

    • 2 years ago
  30. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @FoolForMath - explain please.

    • 2 years ago
  31. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes @FoolForMath they're not understanding what I'm trying to say..that's exactly what I said

    • 2 years ago
  32. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Apoorv scroll up and see the explanation I gave

    • 2 years ago
  33. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    That's what I was saying Foom :P

    • 2 years ago
  34. FoolForMath Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    Drat my typo: \(2\times 3\times 3 =18 \)

    • 2 years ago
  35. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    After a lot of days, I guess I can bet my bottom dollar on this. -_- ( lol I barely have any USD left with me right now to lose :P)

    • 2 years ago
  36. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Aren't there 3 for first, 2 for second, 2 for third because the digits cant repeat?

    • 2 years ago
  37. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Hmm. okay - howzzit '3' choices for the second last digit - after I have chosen one od one, I still have 4 choices in the bank - I can pick any outta those 4. so that makes or 4 choices for the middle digit (or the first one, doesn't really matter)

    • 2 years ago
  38. FoolForMath Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    @apoorvk: If you put 0 in the 100th place then it won't be a 3 digit number.

    • 2 years ago
  39. apoorvk Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Me dumbosta! Ahaaa.. Hmm. Right. I lose approximately 3 quarters and two nickels then. #NotPayingUp -.-

    • 2 years ago
  40. ParthKohli Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Lol

    • 2 years 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.