In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces. -
1, 2, 6, 24,
All the six members of a family A, B, C, D, E and F are travelling together. B is the son of C but C is not the mother of B, A and C are a married couple. E is the brother of C. D is the daughter of A. F is the brother of B.
How many male members are there in the family ?