Asked by precious
find the number of terms in an ap given that its first and last number are 13 and -23 respectively if the common difference is -9
Answers
Answered by
oobleck
Since -23 = 13+4d, there are 5 terms.
So S5 = 5/2 (13-23) = 90
So S5 = 5/2 (13-23) = 90
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