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Question 89
What is the sum of the first 17 terms of an arithmetic progression if the first term is -20 and last term is 28?
Solution
First term of AP = $$a=-20$$ and last term = $$l=28$$
Number of terms = $$n=17$$
Sum of AP = $$\frac{n}{2}(a+l)$$
= $$\frac{17}{2}(-20+28)$$
= $$17 \times 4=68$$
=> Ans - (A)
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