Question

(x-1)+(x+4)+(x+7)+_____+(x+28)=165​

Answer 1

See the attached image for your answer:-

Note: I take the coefficient of x as n+1 because as we see in my solution that we are not take 1 as in the AP series therefore when we add all the x then we have to taken up that x also which is initially add with -1

Or no of terms of AP +1 = n( total no of x).

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