A family has a man, his wife, their four sons and their wives. The family of every son also has 3 sons and one daughter. Find out the total number of male members in the whole family.
1). 16
2). 8
3). 12
4). 17
The male members in the family are:
(1) The man himself
(2) his four sons
(3) And 3 sons of each son of man (3 × 4) = 12 grandsons
Hence the total members (1 + 4 + 12) = 17.