Q. If 2/3, $k$, 5/8 are in AP, then value of $k$ is
A) 15
B) 21
C) 12
D) 31/48
Explanation
(d)
Since, $\frac{2}{3},\ k$ and $\frac{5}{8}$ are in AP.
$\therefore 2k = \frac{2}{3} + \frac{5}{8}\ \ \ \Rightarrow k = \frac{31}{48}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.