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If a set contains 3 elements then the number of subsets is?

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If a set contains 3 elements then the number of subsets is?

(a) 6

(b) 3

(c) 12

(d) 8

I got this question by my college director while I was bunking the class.

This key question is from Subsets topic in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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The correct answer is (d) 8

Best explanation: For elements with n elements the number of subsets are 2^n.

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