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If n is a positive integer, then n3 + 2n is divisible by : (a) 2 (b) 3 (c) 5 (d) 6 |
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Answer» Correct option (b) 3 Explanation: For n = 1, n3 + 2n = 13 + 2 = 3 which is divisible by 3 ∴ n3 + 2n is divisibly by 3 for smallest positive integer. |
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