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24 October, 06:04

What is the sum of the first 11 terms of the arithmetic series in which a1 = - 12 and d = 5?

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  1. 24 October, 06:19
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    Use the formula Sum = n/2 (2a + (n-1) xd)

    So, 11/2 (2x-12 + (11-1) x5)

    =57.2
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