A student needs to buy notebooks $(n)$ for a semester. Double the number of notebooks plus 5 must strictly exceed 15 , but the number of notebooks plus 10 must be no more than 22 . What is the range of notebooks they can buy?
$$ \{6,7,8,9,10,11\} $$
$$ \{6,7,8,9,10,11,12\} $$
$$ \{5,6,7,8,9,10,11,12,13,14,15\} $$
$$ \{5,6,7,8,9,10,11,12\} $$
$$ \text { If }{ }^{\mathrm{n}} C_{13},{ }^{\mathrm{n}} C_{14} \text { and }{ }^{\mathrm{n}} C_{15} \text { are in arithmetic progression, then the positive integer value of ' } \mathbf{n} \text { ' can be } $$
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
$\frac{x^2}{16}+\frac{y^2}{25}=1$
$\frac{x^2}{25}+\frac{y^2}{34}=1$
$\frac{x^2}{25}+\frac{y^2}{16}=1$
$\frac{x^2}{25}+\frac{y^2}{9}=1$
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