MCQ
${ }^{61} C _{57}-{ }^{60} C _{56}$ is equal to :
- A${ }^{61} C _{58}$
- ✓${ }^{60} C _{57}$
- C${ }^{60} C _{58}$
- D${ }^{60} C _{56}$
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The distance of the point of intersection of the lines 2x - 3y + 5 = 0 and 3x + 4y = 0 from the line 5x - 2y = 0 is:
$\frac{130}{17\sqrt{29}}$
$\frac{13}{7\sqrt{29}}$
$\frac{130}{7}$
If $\cos\text{x}=\frac{1}{2}\Big(\text{a}+\frac{1}{\text{a}}\Big),$ and $3\text{x}=\lambda\Big(\text{a}^3+\frac{1}{\text{a}^3}\Big),$ then $\lambda=$