Question 644588
nCr
n!/[r!(n-r)!]
.
41C3
41!/[3!(41-3)!]
41!/[3!38!]
(39*40*41)/[3!]
(39*40*41)/(1*2*3)
(39*20*41)/(3)
(13*20*41)
260*41
10660