[" A traffic light runs repeatedly through the following cycle: green for "30" so seconds,then yellow for "3" seconds,"],[" andthenred for "30" seconds.Leah picks a random three-second time intervalto watchthe light.What is the "],[" probability that the colour changes while shile is watching? "]

A traffic light runs repeatedly through the following cycle: green for 30 seconds,then yellow for 3 seconds,and then red for 30 seconds.Leah picks a random three-second time interval to watch the light.What is the probability that the colour changes while she is watching?

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 complete cycle of a traffic light takes 60s. During each cycle the light is green for 25s, yellow for 5s and red for 30s. At a randomly chosen time, the probability that the light will not be green , is a) 1/3 b) 1/4 c) 4/12 d) 7/12

Kavita decorated her home beautifully with lights on Diwali. She had three strings of blinking lights with different light colours. The lights of first string remain off for 3 seconds, the second string for 5 seconds and the third string for 6 seconds. The time interval after which lights of the three strings will glow again after switching them on at the same time is:

The time period of a seconds pendulum is measured repeatedly for three times by two stop watches A,B. If the readings are as follows , then

An urn contains one black ball and one green ball. A second urn contains one white and one green ball. One ball is drawn at random from each urn. What is the probability that both balls are of same colour?

The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds . If they start changing simultaneously at 8 a.m., after how much time will they change again simultaneously ?