Given :- 4 C + 7 B marbles = total (11 Marbles)

Case 1:-

Solve it By FCP(Fundamental Counting Principles)

2 marble clear ones are chosen so - 4*3 = 12 possibilities
3 marble black ones are chosen so - 7*6*5=210 possibilities

Case 2 :-

now solving by Combinations becuz without replacing means Events are Dependent

2 clear marbles chosen out of 11 marbles of 4 clear ones = 4C2/11C4
3 black marbles chosen out of 11 marbles of 7 black ones = 7C3/11C7