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If two roots of the equation (x - 1) (2...

If two roots of the equation (x - 1) `(2x^2 - 3x + 4)` = 0 coincide with roots of the equation `x^3 + (a + 1) x^2 + (a + b)x+ b = 0`, where a, b e R then 2(a+ b) equals

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