A man has 5 friends and his wife has 4 friends. They want to invite either of their friends, one or more to a party. In how many ways can they do so ?

A man has 5 friends and his wife has 4 friends. They want to invite ei

1.	A man has 5 friends and his wife has 4 friends. They want to invite either of their friends, one or more to a party. In how many ways can they do so ?
A.	9
B.	18
C.	31
D.	46
Answer» E.