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23 January, 16:40

What is the sum of the arithmetic series below?

15

E Fn=4i-1

i=1

A. 930

B. 868

C. 434

D. 465

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Answers (1)
  1. 23 January, 18:22
    0
    Your question transforms to finding the following sum : 3 + 7 + 11 + 15 ... upto 15 terms

    Use formula for sum of an AP series

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

    n - > no of terms in AP series, so n = 15

    a - > first term in series, so a = 3

    d - > common difference, so d = 4

    Put all values for a, n, d and you will get the sum.
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