Subsets and supersets - class-VIII

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Question 1 of 6

The number of subsets of the set $A={ { a } _{ 1 },{ a } _{ 2 },.........{ a } _{ n }} $ which contain even number of elements is

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${ 2 }^{ n-1 }$

${ 2 }^{ n }-1$

${ 2 }^{ n }-2$

${ 2 }^{ n }$

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