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If a set contains n elements, then write the number of elements in its power set.

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If a set contains n elements, then write the number of elements in its power set.

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Let A be the set with n elements. 

Then power set of A contains all the subsets of A. 

Each member of A has two possibilities either present or absent. 

⇒ Total possible subsets of A are 2×2×2×…n times= 2n 

∴ number of elements in power set of A are 2n.

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2n elements are present in power set.

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