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[" Hence,the common difference is given ...

[" Hence,the common difference is given by "d=a_(2)-a_(1)=(r+alpha)-1=alpha" ."],[" Lixample "6" The sum of "n" terms of two arithmetic progressions are in the radi "],[(3n+8):(7n+15)." Find the ratio of their "12^(" th ")" terms."]

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