Posted by Rose on Wednesday, December 12, 2007 at 9:24pm.
Now here the order of things in the group does not matter so we want the number of combinations of 7 out of 19
C(n,r)= n!/[r!(n-r)!]
= 19!/[7!(12!)]
=19*18*17*16*15*14*13/(7*6*5*4*3*2)
=19*3*17*4*1*13/1
=50,388
check my arithmetic for sure if you have a calculator that does factorials.
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