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प्रश्न
Find the cardinal number of the following set.
Q = `{y : y = 4/(3"n"), "n" ∈ "N" and 2 < "n" ≤ 5}`
उत्तर
N = {1, 2, 3, 4, …..}
n ∈ {3, 4, 5}
If n = 3, y = `4/(3(3)) = 4/9`
If n = 4, y = `4/(3(4)) = 4/12`
If n = 5, y = `4/(3(5)) = 4/15`
Q = `{4/9, 4/12, 4/15}`
n(Q) = 3
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