Assume that no man can be a husband to two wives and vice versa (obviously ) ,
(b) 4C1 x 4C2 = 24
(c) If a couple is allowed to serve in the committe , the committe will consist of one couple and another person .
pick one couple from 4 , 6 ppl are left to be picked for the remaining one so 4C1 x 6C1=24
If a couple is NOT allowed to serve , there would be 8C3-24=32 ways to form the committe .