Asked by Ibrahim Yahaya

the sum 11 terms of an AP is 891, find the 25th term and 45th if the common differences is 15.... answer it for me please.
Answered by oobleck
I assume you mean that the sum of the <u>first</u> 11 terms is 891. You have d, so just find a:

11/2 (2a+10*15) = 891

Having a, now just find
a+24d and a+44d
Answered by Joan
I don't know please teach me
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