If the lines r→=a1→+λb1→ and r→=2a2→+λb2→are coplanar, t – InterviewSolution

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1.	If the lines r→=a1→+λb1→ and r→=2a2→+λb2→are coplanar, then a1→ b1→ b2→a2→ b1→ b2→ = _____________.
Answer» If the lines $\vec{r} = \vec{a_{1}} + λ \vec{b_{1}} a n d \vec{r} = 2 \vec{a_{2}} + λ \vec{b_{2}}$ are coplanar, then $\frac{[\vec{a_{1}} \vec{b_{1}} \vec{b_{2}}]}{[\vec{a_{2}} \vec{b_{1}} \vec{b_{2}}]}$ = _____________.

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