Question

A bag contains 5 red balls, 3 black balls and 4 white balls. A ball is drawn out at random. What is the probability that the ball

drawn is red or white or black?

Answer 1

1

Explanation:

Probability of drawing a black ball is:

3/ 12= 0.25

Probability of drawing a red ball is:

5/12= [total number of red balls/ total number of balls]

Probability of drawing a white ball is:

4/12= 1/3 [total number of white balls/ total number of balls]

In probability, 'or' means 'sum'

So we sum them all;

We get: 5/12 + 3/12 + 4/12 =1