Question

A ball will be drawn from the bag containing 20 balls numbered one through 20 if each ball is equally likely to be drawn what is the probability that the number on the bar will be drawn even or less than five

Answer 1

3/5

Explanation:

There are 20 balls, numbered 1 through 20.

Of these, 10 are even, 4 are less than five, and 2 are both even and less than 5.

So the probability is:

P(even or <5) = P(even) + P(<5) − P(even and <5)

P(even or <5) = 10/20 + 4/20 − 2/20

P(even or <5) = 12/20

P(even or <5) = 3/5