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Thread: What use of this?

  1. Dec 14th, 2001, 12:37 AM #1
    prog_tom
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    Post What use of this?

    nCm=n!/(n-m)!m!

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  2. Dec 14th, 2001, 01:05 AM #2
    kedaman
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    It's the amount of combinations you can pick out m out of n
    Used in probability calculus.
    Use
    writing software in C++ is like driving rivets into steel beam with a toothpick.
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    reverse (p (6*9)) where p x|x==0=""|True=chr (48+z): p y where (y,z)=divMod x 13
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  3. Dec 14th, 2001, 05:50 AM #3
    thinktank2
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    They explain the chances of winning the lottery..

    http://lottery.merseyworld.com/Info/Chances.html
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  4. Dec 14th, 2001, 12:41 PM #4
    prog_tom
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    Post You are proposing?

    According to your defination, suppose I would like to seek the combinations between 1 - 10; I use this?

    10C1=10!/9!1!
    whereas
    10 is the answer?

    Only 10 combinations in 1 - 10? I don't think so.

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  6. Dec 14th, 2001, 06:00 PM #5
    thinktank2
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    What's Wrong with that ???

    When you say 10C1

    you are asking how many different numbers can I pick from a set of 10 numbers if i pick 1 number at a time ?

    More Literally...

    If you have 10 friends and you want to meet them 1 at a time
    how many different friends can you meet ??

    The answer is 10.


    Lets take 10C2

    If You have 10 friends and you want to meet 2 of them together at a time how many different combinations of friends can you meet ??


    Answer = 10!/[(10-2)! * 2!] = 10!/(8! * 2)

    = (10 * 9 * 8!)/(8! * 2)

    = 90/2 = 45

    So you can meet 45 combinations of friends if you meet 2 of them at a time.
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