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Posted by Anonymous on Monday, February 4, 2013 at 11:11am.

Find five numbers in A.P. whose sum is 12.5 and the ratio of first to the last is 2 : 3.

5/2 (2a+4d) = 25/2 a/(a+4d) = 2/3 a=2 d=1/4 2, 2¼, 2½, 2¾, 3, ...

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