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Number of power set of {a, b}, where a and b are distinct elements.

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Number of power set of {a, b}, where a and b are distinct elements.

(a) 3

(b) 4

(c) 2

(d) 5

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I'd like to ask this question from Types of Set topic in portion Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Correct choice is (b) 4

Explanation: Power set of {a, b} = {∅, {a, b}, {a}, {b}}.

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