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[" Prove that there is no rational number whose square is "6" ."],[" 3.The natio of the "11" th term to the "18" th term of an A.P.is "2:3" .Find the ratio of the "5" th term to the "21" st term,"],[" and allo the ratio of the sum of the first five terms to the sum of the first "21" terms."]

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