Jurors

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Jurors

by Cybermusings » Mon May 21, 2007 9:40 am
Jurors
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Re: Jurors

by jayhawk2001 » Mon May 21, 2007 12:23 pm
Question stem: We are asked to find (n-m)C12

1 - Sufficient.
(n-m+1)C12 = 13
(n-m+1)! / (n-m-11)!*12! = 13

(n-m+1)*(n-m)! / (n-m-11)!*12! = 13

Since 13 is a prime number, only n-m = 12 can solve this eqn.
So, sufficient.

To prove (or disprove), take n-m=13, we have 14*13! / 2*12! = 14*13/2
not equal to 13.

2 - sufficient.
n-m = 12, so we can find (n-m)C12

Hence D