Last updated at Jan. 27, 2020 by Teachoo
Ex 1.3, 5 How many elements has P(A), if A = ϕ ? P(A) is the power set of set A Number of elements of P(A) = 2n where n is the number of elements of the set A Given A = ϕ, then number of elements of set A = 0. ∴ Number of elements of P(A) = 2n = 20 = 1 Hence, P(A) has one element.
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