Question

There are 20 tickets in a box , each bearing one of the numbers from 1 to 20. One ticket is drawn at random from the box. Find the probability of the event that the ticket drawn shows a prime number . * 20 5 / 2 2 / 5 9 / 20

Answer 1

Possible outcomes = 2, 3, 5, 7, 11, 13, 17, 19

Probability (ticket shows prime number) = 8/20 = 2/5

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Answer 2

There are 8 prime numbers (2,3,5,7,11,13,17,19) from 1 to 20

so probability is 8/20

= 2/5

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