Question

Write down the power set for the set, A = {a,b}

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Answer 1

Answer:

power set of {a,b} is 2^n formulae

{a},{b},{a,b},{ }

therefore no.of sets =4

Answer 2

Answer:

P(S) = { {}, {a}, {b}, {c}, {a, b}, {a, c}, {b, c}, {a, b, c} }

Think of it as all the different ways we can select the items (the order of the items doesn't matter), including selecting none, or all.