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If the sum of the roots of the equation `x^2-(k+6)x+2(2k-1)=0` is equal to half of their product, then `k=` (a) 6 (b) 7 (c) 1 (d) 5

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  13. If the sum of the roots of the equation x^2-(k+6)x+2(2k-1)=0 is equ...

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