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Write down all possible subsets of `A={2,3}`

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Write down all possible subsets of `A={2,3}`
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`phi {2}, {3}, {2,3}`.
`therefore P(A) ={phi, {2}, {3}, {2,3}}`.
Thus, `n(A) =2 and n{P(A}}=4=2^2`.
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Write down all possible subsets of `phi`.
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