Q1 of 128 Page 13

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?

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


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