A car hire firm has 12 cars available for hire, 5 are red, 4 are blue and 3 are white. All 12 cars are equally likely to breakdown. in a month 3 different cars suffer a breakdown, calculate the probability that. A) exactly 2 are red?
by 
shax5292
ANSWERS: 1
-
The answer is the same as asking: In what proportion of times when you choose three cars from the 12 cars will you get two red ones. Or, what is the number of ways of choosing two red cards and one non-red car divided by the number of ways of choosing three cars. Or, 5C2 * 7C1 / 12C3 5C2 is the 'binomial coefficient' or "5 choose 2" and it is calculated by (5*4)/(2*1) where the number of numbers on the top and bottom is the same.
RELATED QUESTIONS
Copyright 2023, Wired Ivy, LLC