Coefficient independent of x in the expansion of \([\frac{3x^{2}-1}{2x^{5}}]^{7}\) is?
The number of real roots of the equation
[ x |x| - 5 |x + 2| + 6 = 0 ] , is:
Let: $\vec{a}=\hat{i}+2 \hat{j}+3 \hat{k}, \vec{b}=\hat{i}-\hat{j}+2 \hat{k}$ and $\vec{c}=5 \hat{i}-3 \hat{j}+3 \hat{k}$ be there vectors If $\vec{r}$ is a vector such that, $\vec{r} \times \vec{b}=\vec{c} \times \vec{b}$ and $\vec{r} \cdot \vec{a}=0$, then $25|\vec{r}|^2$ is equal to