Determine the number of positive integers n, 1 n 2000, that are (a) Not divisible

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Determine the number of positive integers n, 1 ≤ n ≤ 2000, that are
(a) Not divisible by 2, 3, or 5
(b) Not divisible by 2, 3, 5, or 7
(c) Not divisible by 2, 3, or 5, but are divisible by 7
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