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4 May, 15:12

For an arithmetic sequence where a1 = 13 and the common difference is 3, find s7.

A. 162

B. 151

C. 157

D. 154

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Answers (1)
  1. 4 May, 16:18
    0
    A 1 = 13, d = 3;

    S n = n/2 * (a 1 + a n)

    a 7 = a 1 + 6 d = 13 + 3 * 6 = 13 + 18 = 31

    S 7 = 7/2 * (13 + 31) = 7/2 * 44 = 154

    Answer:

    D) 154
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