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In an AP if a = 1, an = 20 and Sn = 399, then n is (A) 19 (B) 21 (C) 38 (D) 42

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In an AP if a = 1, an = 20 and Sn = 399, then n is

(A) 19 (B) 21 (C) 38 (D) 42

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Correct answer is  (C) 38

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