1.

If A = {1, 2, 3, 4, 5}, then the number of proper subsets of A is A. 120 B. 30 C. 31 D. 32

Answer»

Here, 

n(A) = 5 

⇒n(P(A) ) = 25 = 32 

So,

A has total 32 subsets but one of them is A itself. 

∴ Proper subsets of A are 32 -1 = 31.



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