Question

3. A number between 30 and 50 is chosen at random. What's the probability that the

number contains at least one 4?

Answer 1

0.5789

Explanation:

The successful events would be 34 , 40 41 42 43 44 45 46 47 48 49

The total number of ways 19 when you count from 31 to 49

P(1 four) = 11/19 = 0.5789