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12 July, 17:05

What is the 32nd term of the arithmetic sequence where a1 = 15 and a13 = - 57?

A) - 171

B) - 165

C) - 158

D) - 151

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  1. 12 July, 17:22
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    (-57 - 15) / (13 - 1) = - 6

    a (n) = 15 - 6· (n - 1)

    a (32) = 15 - 6· (32 - 1) = - 171
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