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If a set $A$ has 4 elements, then the total number of proper subsets of set $A$, is
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15
$n(A)=4$ (given)
$\therefore$ Total number of subsets of $A=2^{4}=16$
$\therefore$ Number of proper subsets $=16-1=15$
$\therefore$ Total number of subsets of $A=2^{4}=16$
$\therefore$ Number of proper subsets $=16-1=15$
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