Question

Let $\bar{a}=\hat{i}+2\hat{j}-3\hat{k}$ and $\bar{a}+\bar{b}=4\hat{i}-2\hat{j}+\lambda\hat{k}$. If $\bar{a}\cdot\bar{b}=4$, then the value of $\lambda$ is equal to

• A. 3
• B. -3
• C. -6
• D. 6
• E. 0

Answer 1

Answer: (C)

-6

Answer 2

The correct option is (C) : -6