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3 June, 00:14

Find the sum of the arithmetic series for which a_1 = 7, n = 31, and a_n = 127.

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  1. 3 June, 01:24
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    Answer: 2077

    There are 31 terms.

    S₃₁ = 31 (a₁+a₃₁) / 2 = 31 (7+127) / 2 = 2077
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