Question 620520
C(n,r) = (n!)/(r!(n-r)!)


C(9,5) = (9!)/(5!*(9-5)!)


C(9,5) = (9!)/(5!*4!)


C(9,5) = (9*8*7*6*5!)/(5!*4!)


C(9,5) = (9*8*7*6)/(4!)


C(9,5) = (9*8*7*6)/(4*3*2*1)


C(9,5) = (3024)/(24)


C(9,5) = 126


So the answer is <font color="red">126</font>