If \( P(X) \) represents the power-set of set \( X \) and the number of subsets of \( P(P(P(\phi...

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If \( P(X) \) represents the power-set of set \( X \) and the number of subsets of \( P(P(P(\phi))) \) is \( k \) (whe e \( \phi \) represents the null set).
Then \( \frac{k}{2} \) is equal to
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