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Mathematics, 05.09.2021 16:10 Teephat

In an arithmetic progression of 21 terms, the sum of the first 2 terms is −26 and that of the middle 3 is 75. Find the first term and the common difference. Hence, determine the total sum of the arithmetic progression.

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In an arithmetic progression of 21 terms, the sum of the first 2 terms is −26 and that of the middle...

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