Let $\vec{a}$ and $\vec{b}$ are non collinear vectors. If vectors $\vec{\alpha }=\left(\lambda -2\right)\vec{a}+\vec{b}$ and $\vec{\beta }=\left(4\lambda -2\right)\vec{a}+3\vec{b}$ are collinear, then $\lambda$ is equal to (a) $-4$ (b) $4$ (c) $2$ (d) $-2$

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