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Solution


Q.

Let the number of elements in sets A and B be five and two respectively. Then the number of subsets of A x B each having at least 3 and at most 6 elements is        [2023]
1 752  
2 792  
3 772   
4 782  

Ans.

(2)

Given, n(A)=5, n(B)=2 

∴    n(A×B)=10 

∴    Required number of subsets= 10C3+ 10C4+ 10C5+ 10C6

= 120+210+252+210 = 792