Asked by Anonymous

An arithmetic series has first term 5 and a common difference 7

a) write down the 4th term and the 23rd term


b) find the sum of the first 38 terms of this series.

Answers

Answered by Steve
Tn = 5 + 7(n-1) = 7n-2

S38 = 38/2 (2*5 + 37*7)
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