arithmetic

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The sum of the first 10th term of an a.p is 255,the sum of the first 20 term is 1010.find the next 2020 term of the progression

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10/2[2a+(10-1)d=255 20/2[2a+(20-1)d=1010. So a=3, and d=5. Then the 2020 term is 3+(2020-1)5.And the answer is 10098.

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