A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 4 years ago

Does anyone know how to compute these following combinations? 1. C(6,4) 2. C(7,5) 3. C(9,6) 4. C(8,2) x C(8,6)

  • This Question is Closed
  1. campbell_st
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    the formula is \[nCr = (n!)/((r!)\times(n-r)!)\] \[6C4 = 6!/((4!)\times(6-4)!)\] You should have a calculator function that does it for you....

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

    yea but we cant use calculators for the test

  3. campbell_st
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    its factorial notation (6x5x4x3x2x1)/((4x3x2x1)x(2x1)) cancel common factors and you'll be left with 3 x 5 = 15

  4. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    why the 2x1 at the end of the equation come from

  5. campbell_st
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    because the formula says (n-r)! this is 6 - 4)! or (2)!

  6. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok thank you very much

  7. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.