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find the sum of the first 25 term of the arithmetic sequence 17,22,27,32
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The sum of the first 25 term of the arithmetic sequence ( 17,22,27,32) is :

(d)= T2-T1.

= 22-17=5

And by applying :

sn= n/2{2×T1+(n-1)d}

When n=25 , T1= 17 ,d=5.

So sn = 25/2{2×17+(25-1)×5}= 1925.

The answer is = 1925.

by (13.6k points)

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