MCQ
The direction cosine of $y$-axis is:
- A$0,0,0$
- B$1,0,0$
- ✓$0,1,0$
- D$0,0,1$.
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$\frac{\pi}{60}$
$\frac{\pi}{20}$
$\frac{\pi}{40}$
$\frac{\pi}{80}$
| $\text{X}$ | $2$ | $3$ | $4$ | $5$ |
| $\text{P}(\text{X})$ | $\frac{5}{\text{k}}$ | $\frac{7}{\text{k}}$ | $\frac{9}{\text{k}}$ | $\frac{11}{\text{k}}$ |