Asked by Anthony

Why do you make it clear so that I can understand how to calculate
Answered by Anthony
The sum of the first eight terms of an arithmetic progression is 220 if the third terms is 17.
Find the sum of the first six terms?
Answered by oobleck
8/2 (2a+7d) = 220
a+2d = 17
a=3 and d=7
That makes the sum you want
S6 = 6/2 (2*3+5*7) = ____
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