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Math Help - simplify the ratio of factorials

  1. #1
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    simplify the ratio of factorials

    (n+1)! / (n-2)!

    thx 4 all the ppls that come in and read my post ^^
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  2. #2
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    Quote Originally Posted by cwlcwl1212 View Post
    (n+1)! / (n-2)!
    thx 4 all the ppls that come in and read my post ^^
    Hint:
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  3. #3
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    i understand that (n+1)! = (n+1) x (n+1-1)

    but i don't understand how can i extract (n-2)! to the equation i need...
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  4. #4
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    n! = n * (n-1) * (n-2)!
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  5. #5
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    Quote Originally Posted by cwlcwl1212 View Post
    i understand that (n+1)! = (n+1) x (n+1-1)
    Well, there's your problem, then, because what you "understand" is wrong.
    What is true is that (n+1)!= (n+1)(n+1-1)(n+1- 2)... (3)(2)(1)= (n+1)(n)(n-1)(n-2)...(3)(2)(1).

    but i don't understand how can i extract (n-2)! to the equation i need...
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