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16. Determine the cardinal number of sets, number of subsets and number of proper subsets

P = {x : x = \frac{7}{2 n}, n \in ℕ and 3 \leq n \leq 6}

The cardinal number of the set \(P =\)

i

Q = {a, f, g, j, o, p}

The number of subsets of \(Q\) is .

The number of proper subsets of \(Q\) is .

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