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