The number of proper subsets of the set {1, 2, 3} is

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Solution

The correct option is B
7

A = {1, 2, 3} $\Rightarrow$ n(A) = 3

We know that the Number of proper subsets of set with n elements is $2^{n} - 1$

$∴$ Number of proper subsets of the set A is

$= 2^{3} - 1 = 7$

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