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Math Help - permutation and combination

  1. #1
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    permutation and combination

    Calculate number of ways
    (a) 5 children can be divided into group of 2 and 3,(ans: 10)
    (b) 9 children can be divided into group of 5 and 4,(ans: 126)
    Hence calculate number of ways in which 9 children can be divided into groups of 2,3 and 4.(ans: 1260)

    thank for tour time and help
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  2. #2
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    Quote Originally Posted by nikk View Post
    Calculate number of ways
    (a) 5 children can be divided into group of 2 and 3,(ans: 10)
    (b) 9 children can be divided into group of 5 and 4,(ans: 126)
    Hence calculate number of ways in which 9 children can be divided into groups of 2,3 and 4.(ans: 1260)
    You have the answers, so what is the question?
    Do you want to know how?
    \frac{9!}{(2!)(3!)(4!)}=1260
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  3. #3
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    Quote Originally Posted by Plato View Post
    You have the answers, so what is the question?
    Do you want to know how?
    \frac{9!}{(2!)(3!)(4!)}=1260
    i don't no how to calculate it sir.tq for your step. how abour a&b
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  4. #4
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    Quote Originally Posted by nikk View Post
    i don't no how to calculate it sir.tq for your step. how abour a&b
    If that is true then why are you asked to do these problems?
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