While driving from his house to work each day,Jack Hammer passes 3 stoplights.If the probability of getting a red light is 1/3 for each of the 3 lights,what is the probability that Jack hits at least one red light?
A)7/27
B)8/27
C)9/27
D)19/27

Question

Quizplus · Accepted Answer

The easiest way to solve this problem is to calculate the probability of the opposite event (not hitting any red lights) and subtracting that from 1. The probability of not hitting a red light at each stoplight is 2/3, so for all three lights, it's (2/3)^3 = 8/27. Therefore, the probability of hitting at least one red light is 1 - 8/27 = 19/27.

While Driving from His House to Work Each Day,Jack Hammer