30. If the 1st term of a series is 7 and 13*term is 35. Find the sum o – InterviewSolution

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30. If the 1st term of a series is 7 and 13*term is 35. Find the sum of 13 terms ofICBSE 2012the sequence

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Explanation : 1st term is 7 13th term is 35 Sum of 13 terms = 13/2 * (1st term + 13th term) = 13/2 * (7+35) = 13/2 * 42 = 13*21 = 273

Answer : 273

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