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  • When A = φ, then number of elements in P(A) is ______________.

WhenA = \phi, then number of elements in P(A) is ______________.

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WhenA = \phi, then number of elements in P(A) is 1

Here A = \phi, n(A) = 0

        \begin{aligned} n[P(A)] &= 2^{n(A)} \\ &= 2^0 \\ &= 1\end{aligned}

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