Question 387004
nCr=combination of n things taken r at a time.
a)
13C4 * 39C1 
= 715 * 39
=27885
.
b)
12C2 * 40C3
=66*9880
=652080
.
c)
26C2*13C2*13C1
=325*78*13
=329550
.
Ed