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The second term of an arithmetic progression is 8 and the eleventh term is -10 Find the first term, the common differrnce and sum to 15 terms
9 years ago

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Steve
the two terms are 9d apart. So, d = -2

Now you have d, and can easily find a, so

S15 = 15/2 (2a + 14d)
9 years ago

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