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

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asked Feb 1, 2018 in Mathematics by Kundan kumar (49,132 points)

In an AP, if a =1, a_n, = 20 and S_n = 399, then find n

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answered Feb 1, 2018 by Vikash Kumar (144,729 points)

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

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