Question 612345
C(12, 5)={{{12!/(5!*(12-5)!)}}}
={{{12!/(5!*7!)}}}
={{{12*11*10*9*8*7!/(5*4*3*2*1*7!)}}}
={{{11*10*9*8/(5*2)}}}
={{{11*9*8}}}
=792