the sum of first 17 terms of an arithmetic sequence is 306
a. find its 9th term
b.find the sum of first term and 17th terms
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Upon doing that we equate the expression of the 17th term to −13 which will give us the value of common difference of the A.P, thus we determine the A.P. Complete step by step answer: We are given that the sum of first 17 terms of the A.P is 187and the 17th term is −13 .
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