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15 March, 06:51

Find the sum of the series described by a1 = - 10, d = 1.5 and n = 25.

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  1. 15 March, 07:04
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    A (n) = a₁ + d (n - 1)

    a (n) = - 10 + 1.5 (25 - 1)

    a (n) = - 10 + 1.5 (24)

    a (n) = - 10 + 36

    a (n) = 26
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