Cards each marked with one of the numbers 4, 5, 6, ..., 20 are placed in a box and mixed thoroughly. One card is drawn at random from the box. What is the probability of getting an even number?

Question

Philoid · Accepted Answer

The total number of elementary events are: 4,5,6 …..20 = 20 – 3= 17

Let E be the event of getting an even number on the random draw

Then total favorable outcomes are: 4, 6, 8, 10, 12, 14, 16, 18, 20

Total number of favorable outcomes = 9

P (even number) = P (E) = 9/17