$$ \text { If }{ }^{\mathrm{n}} C_{13},{ }^{\mathrm{n}} C_{14} \text { and }{ }^{\mathrm{n}} C_{15} \text { are in arithmetic progression, then the positive integer value of ' } \mathbf{n} \text { ' can be } $$
34
14
24
41
If $2 \sin \theta=\left(x+\frac{1}{x}\right)$, then $\sin 3 \theta+\frac{1}{2}\left(x^3+\frac{1}{x^3}\right)=$
1
-1
3
0
If the two ends of the major axis of an ellipse are $(5,0)$ and $(-5,0)$ and one focus lies on the line $3 x-5 y-9=0$, then its equation is
$\frac{x^2}{16}+\frac{y^2}{25}=1$
$\frac{x^2}{25}+\frac{y^2}{34}=1$
$\frac{x^2}{25}+\frac{y^2}{16}=1$
$\frac{x^2}{25}+\frac{y^2}{9}=1$
The function $\boldsymbol{f}(\boldsymbol{x})=|\boldsymbol{x}|+|\boldsymbol{x}-\mathbf{1}|$ is:
Neither differentiable at $x=0$ nor $x=1$
Differentiable at $x=0$ but not at $x=1$
Differentiable at $x=1$ but not at $x=0$
Differentiable at $x=0$ and $x=1$
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