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15 December, 04:39

What is the sum of the series?

10

Σ (7k - 2)

k=1

+5
Answers (1)
  1. 15 December, 05:00
    0
    365

    Step-by-step explanation:

    The simplest method is to substitute values of k = 1 to 10 into the expression and sum the terms, that is

    7 (1) - 2 + 7 (2) - 2 + 7 (3) - 2 + 7 (4) - 2 + 7 (5) - 2 + 7 (6) - 2 + 7 (7) - 2 + 7 (8) - 2 + 7 (9) - 2 + 7 (10) - 2

    = 5 + 12 + 19 + 26 + 33 + 40 + 47 + 54 + 61 + 68

    = 365
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