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  4. If A=1, 2, 3, 4, 5, 6, 7 then number of proper subsets of A is

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Q. If A={1, 2, 3, 4, 5, 6, 7} then number of proper subsets of A is

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Solution:

$n (A) = 7$. Number of subsets of $A = 2^7 - 1 $