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

powerangers69

A four- digit number ( with no repetitions) is to be formed from the set of number ( 0,1,2,3,4,5,6,7). Find the probability that the number : a) is even

  • one year ago
  • one year ago

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

    You first find the number of four-digit numbers that may be formed from the above set.

    • one year ago
  2. telliott99
    Best Response
    You've already chosen the best response.
    Medals 0

    Think of it this way, pick the numbers from right to left, least significant first.

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

    Can you do that? \[8P4 \] But there is something—we can't place a zero.

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

    the probability is 50 %

    • one year ago
  5. powerangers69
    Best Response
    You've already chosen the best response.
    Medals 0

    i did 6x6x5x4 ------- 7x7x6x5 ?

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

    Let's think of slots. _ _ _ _ Four slots. We have 7 choices for the first(there are eight numbers in the set, but we can't place a zero). 7 for the second too(we have a zero with us the second time). 6 for the third. (We already have two numbers filled out of eight). 5 for the fourth. (We have three filled).

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

    We multiply \(7 \times 7 \times 6 \times 5 \Longrightarrow 49 \times 30 \)

    • one year ago
  8. powerangers69
    Best Response
    You've already chosen the best response.
    Medals 0

    yes then? number of even numbers = 6x6x5x4 i that correct

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

    First find the number of four digit numbers you could make, then divide that by 2.

    • one year ago
  10. powerangers69
    Best Response
    You've already chosen the best response.
    Medals 0

    um answer is not 1/2 though

    • one year ago
  11. mihai
    Best Response
    You've already chosen the best response.
    Medals 0

    every number that ends with a 0,2,4 and 6 is an even number, so if 4 out of 8 digits give you an even number wouldn't that be 50/50?

    • one year ago
  12. telliott99
    Best Response
    You've already chosen the best response.
    Medals 0

    @ParthKohli see my post above. Make sense?

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

    Yup! That's correct!

    • one year ago
  14. powerangers69
    Best Response
    You've already chosen the best response.
    Medals 0

    @ParthKohli answer is given as 780/1470 not 735/1470?

    • 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.