An urn contains 10 red and 8 white balls. One ball is drawn at random. Find the probability that the ball drawn is white.
Total number of possible outcomes, n(S) = 10 + 8 = 18
Number of events of getting white ball, N(E) = 8
Probability, 
11
An urn contains 10 red and 8 white balls. One ball is drawn at random. Find the probability that the ball drawn is white.
Total number of possible outcomes, n(S) = 10 + 8 = 18
Number of events of getting white ball, N(E) = 8
Probability,