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The second and the fourth term of an A.P. is 12 and 20 respectively. Find the sum of the first 25 terms of that A.P.

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The second and the fourth term of an A.P. is 12 and 20 respectively. Find the sum of the first 25 terms of that A.P.

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\(\therefore\) The sum of first 25 terms is 1400.

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