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Find the sum of first 25 terms of an A.P...

Find the sum of first 25 terms of an A.P. whose nth term is `1- 4n`

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  2. solve for x and y, x+ (6/y)=6,3x-(8/y)=5

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  3. Find the sum of first 25 terms of an A.P. whose nth term is 1- 4n

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