Question

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QUESTION: sum of 1st and last terms of an A.P. is 20. Find the sum of 1st 40 terms of that AP.

Class-10th Problem

Solution is mandatory!​

Answer 1

Answer:

400

Here is ur answer...Coronovirus

Answer 2

Answer:

Let a be the first term and d be the common difference of the given A.P. And the sum of the first 20 terms be S(20). Hence, the sum of its first 10 terms is 100.

Explanation:

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