Asked by Anonymous
In an arithmetic series, the 15th term is 43 and the sum of the first 15 terms is 120. Add the first 20 terms of the series.
Answers
Answered by
Steve
a+14d = 43
15/2 (2a+14d) = 120
(a,d) = (-27,5)
S20 = 20/2 (2a+19d) = 410
15/2 (2a+14d) = 120
(a,d) = (-27,5)
S20 = 20/2 (2a+19d) = 410
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