Post a New Question

Math

posted by on .

If n!/2=(n-2)! then n=?

  • Math - ,

    n(n-1)(n-2)!/2 = (n-2)!
    n(n-1)/2 = 1
    n(n-1) = 2
    n^2 - n - 2 = 0
    (n-2)(n+1) = 0
    n = 2

    check: 2!/2 = 0!
    2/2 = 1

    Seems they could have come up with a better problem for using this concept.

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question