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10 March, 17:54

Find the sum of the first 50 terms In An = 3n + 2

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  1. 10 March, 19:46
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    Hello:

    this arithmetic sequence the first term is : A1 = 3 (1) + 2=5

    and common difference is r = 3

    the sum of the first 50 terms is : S50 = 50/2 (A1 + A50)

    A50 = 3 (50) + 2 = 152

    S50 = 50/2 (5 + 152) = 3925
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