1.

If A={a,b,c}, then what is the number of proper subsets of A?A. 5B. 6C. 7D. 8

Answer» Correct Answer - C
Let A={a,b,c} implies O(A)=3
Now, number of proper subsets of
`A=2^(O(A))-1=2^(3)-1=7`


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