An urn contains 10 red and 8 white balls. One ball is drawn at random. Find the probability that the ball drawn is white.

Given:

An urn contains 10 red and 8 white balls

One ball is drawn at random

To find:  Find the probability that the ball drawn is white.

Solution:

Number of red balls = 10

Number of white balls = 8

Total number of possible events = 18

Number of favourable events, the event of drawing a white ball = 8

So probability of drawing a white ball

= $\frac{Number\ of\ favourable\ events}{Number\ of\ possible\ events}$

= $\frac{8}{18}$ = $\frac{4}{9}$ Answer

Therefore the probability of drawing a white ball is $\frac{4}{9}$