Question

The value of $\lambda$ so that the points $P,Q,R,S$ on the sides $OA,OB,OC$ and $AB$ of a regular tetrahedron are co-planar. When $\frac{OP}{OA}=\frac{1}{3};\frac{OQ}{OB}=\frac{1}{2};\frac{OR}{OC}=\frac{1}{3}$ and $\frac{OS}{AB}=\lambda$ is

• A. $\lambda =\frac{1}{2}$
• B. $\lambda =-1$
• C. $\lambda =0$
• D. $\lambda =2$

Answer 1

Answer: (B)