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April 18, 2015

April 18, 2015

Posted by **katie** on Tuesday, September 12, 2006 at 4:43pm.

It's actually 6 choose 2 objects

The definition of nCr or n choose r is

(1) n!/(r!(n-r)!)

Here n=6 and r=2 so we have 6!/(2!*(6-2)!)= (6*5*4!)/(2!*4!)= 6*5/2! = 3*5=15

The formula (1) is what you should remember here.

25

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