**Concept: The question tests on basics of Selection.**

**Solution: **At least 3 men in the question implies 3men and 2 women Or 4 men and 1 woman Or 5 men and 0 women.

The Or condition implies an addition here after every case is computed.

Hence

(7C3)*(6C2) to select 3men and 2 women or

(7C4)*(6C1) to select 4 men and 1 woman or

(7C5)*(6C0) to select 5 men and 0 women.

Adding all we have (7C3)*(6C2) + (7C4)*(6C1) + (7C5)*(6C0)

= 525 +210+ 21

= 756

**(Option D)**