If 1, -2 & 3 are the roots of x^(3)-2x^(...

If `1, -2 & 3` are the roots of `x^(3)-2x^(2)+ax+6=0` then find `a`

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If 1,-2 and 3 are roots of
`x^3-2x^2+ax+6=0` , then find a .
`rArr 1(-2)+(-2)3+3.1=a `
i.e ,a =-2-6+3=-5

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