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[" 27.If for an A.P."a(1),a(2),a(3),...,...

[" 27.If for an A.P."a_(1),a_(2),a_(3),...,a_(n),...],[a_(1)+a_(3)+a_(5)=-12" and "a_(1)a_(2)a_(3)=8],[" then the value of "a_(2)+a_(4)+a_(6)" equals "]

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