Question

A bag contains 5 black, 7 red and 3 white balls. A ball is drawn from the bag at random. Find the probability that the ball drawn is: 1. Red 2. No black 3. Black or white

Answer 1

Dear Student
given
black balls = 5
red balls = 7
white balls = 3
total = 15
1. P(red ball) = number of red balls/total balls = 7/15
2. P(no black) = 1 - P(black) = 1 - 5/15 = 10/15 = 2/3
3. P(black or white) = number of black balls + number of white balls/ total balls
= 5+3/15 = 8/15
regards