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[*" 3.Let "a(1),a(2),a(3),..." be an A.P...

[*" 3.Let "a_(1),a_(2),a_(3),..." be an A.P."," (C) "4b^(2)-ac," (D) "b^(2)-4ac],[*," Let "a_(1),a_(3),a_(3),..." be an A.P.such that "(a_(1)+a_(2)+...+a_(p))/(a_(1)+a_(2)+a_(3)+...+a_(4))=(p^(3))/(q^(3));p!=q." Then "(a_(6))/(a_(21))" is equal to "]

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