JEE PYQ: Vector 3D Question 13
Question 13 - 2021 (18 Mar Shift 2)
Let the mirror image of the point $(1, 3, a)$ with respect to the plane $\vec{r} \cdot (2\hat{i} - \hat{j} + \hat{k}) - b = 0$ be $(-3, 5, 2)$. Then the value of $|a + b|$ is equal to ______.