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Two vectors A and B lie in a plane, a third vector C lies outside this plane, sum of these vectors A + B + C
Explanation
Given $\vec{A}$ and $\vec{B}$ lie in a plane and vector $\vec{C}$ lies outside this plane. Resultant vector of $\vec{A}$ and $\vec{B}$ lies in the same plane as that vectors $\vec{A}$ and $\vec{B}$. Resultant vector of $\vec{A}$, $\vec{B}$ and $\vec{C}$ in non-coplanar vector therefore, their resultant can never be zero.