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The sum of the first 20 terms of an AP whose first term and third term are 25 and 35, respectively is

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The sum of the first 20 terms of an AP whose first term and third term are 25 and 35, respectively is 

(a) 1200 

(b) 1250 

(c) 1400 

(d) 1450 

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1 Answer

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Best answer

Correct option (d) 1450

Explanation:

a = 25, a + 2d = 35 means d = 5. The 20th term would be a + 19d = 25 + 95 = 120. 

The sum of the series would be given by: [20/2] × [25 + 120] = 1450. 

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