If $\vec{a},\vec{b},\vec{c}$ are non-coplanar vector and $\lambda$ is a real number, then the vectors $\vec{a}+2\vec{b}+3\vec{c},\lambda \vec{b}+\mu \vec{c}and\left(2\lambda -1\right)\vec{c}$ are coplanar when a. $\mu \in R$ b. $\lambda =\frac{1}{2}$ c. $\lambda =0$ d. no value of $\lambda$

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