Q. A complete cycle of a traffic light takes 60 s. During each cycle the light is green for 25 s, yellow for 5 s and red for 30 s. At a randomly chosen time, the probability that the light will not be green, is
A) $\frac{1}{3}$
B) $\frac{1}{4}$
C) $\frac{4}{17}$
D) $\frac{7}{12}$
Explanation
(d)
$\therefore Required\ probability = \frac{30 + 5}{60} = \frac{7}{12}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.