Find the number of Subsets in A X B with at least 3 Elements IIT JEE

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Q1. Set A has 3 elements. Find the number of sub-sets of A.
A 3 B 6 C 8 D 9

Q2. Set B has 4 elements. Find the number of sub-sets of B each having at-least two elements.
A 16 B 14 C 11 D 10

Q3. Let A and B be two sets containing four and two elements respectively. Then the number of subsets of A X B, each having at least three elements is
A 219 B 256 C 275 D 510