Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
If the vectors $\overrightarrow{\mathrm{a}}=3 \hat{\mathrm{i}}+\hat{\mathrm{j}}-2 \hat{\mathrm{k}}$ and $\overrightarrow{\mathrm{b}}=\hat{\mathrm{i}}+\lambda \hat{\mathrm{j}}-3 \hat{\mathrm{k}}$ are perpendicular to each other then $\boldsymbol{\lambda}=$ ?
A. $-3$
B. $-6$
C. $-9$
D. $-1$
Solution:
