Math, asked by zahidashaikh2522, 11 months ago

The first term of an AP is 1 and the last term is 20. Sum of all terms is 399.

Answers

Answered by jainishpjain

6

sum = (a+l)×n/2

399 = (20 +1)×n÷2

(399×2)÷21= n

n = 38

Hope this answer helps pls mark as brainliest.

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