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Factorial!!

Expert replies
Source: — Problem Solving |

by kstv » Tue Mar 16, 2010 8:30 am
it can be n! = n (n-1) (n-2)!

so n(n-1) = 90*2
then solve for n²-n-180=0
it appears the roots are not real no
maybe the Q was 45*2
in which case n =10
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by gmat_perfect » Tue Mar 16, 2010 9:15 am
thanks.
I got it.
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by mj41 » Sun Mar 21, 2010 8:56 pm
I got to the wadratic equation but dont know how you got to n=10
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