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[" 12.The sum of first six terms of an A...

[" 12.The sum of first six terms of an A.P.is "42." The ratio of its "10^(" th ")" term to its "30^(" th ")" term "],[" is "1:3" .Find the first term of the A.P."],[" 13.Exom the ten of elists them of the A.P."]

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