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3 September, 17:14

The first term in an arithmetic series is 9, while the last term in the series is - 191. if there are 25 terms in the series, what is its sum?

+4
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  1. 3 September, 17:38
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    191+9 = 200

    200/25 = 4

    since you are decreasing, the number is negative,

    thus the answer is - 4
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