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[" 11.For what value of "k" ,the quadrat...

[" 11.For what value of "k" ,the quadratic equation "kx^(2)+11x-4=0" has real roots? "],[" 12.If the sum of "n" terms of an A.P.is "S_(n)=3n^(2)+5n" ,then write its common difference."],[qquad " OR "]

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