Least n for which a trig equation has exactly k solutions in [0, n pi/2]

1. A.
   $\frac{1}{2^{15}}\left( 2^{14} - 14 \right)$
2. B.
   $\frac{1}{2^{14}}\left( 2^{15} - 15 \right)$
3. C.
   $1 - \frac{15}{2^{13}}$
4. D.
   $\frac{1}{2^{13}}\left( 2^{14} - 15 \right)$

Tap an option to check your answer.

1. A.
   $(0,\infty)$
2. B.
   $( - \infty,0)$
3. C.
   $\left( - \frac{\sqrt{17}}{2},\frac{\sqrt{17}}{2} \right)$
4. D.
   $Z$

Tap an option to check your answer.