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?

1

Step-by-step 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