one ticket is drawn at random from a bag containing 20 tickets numbered 1 to 20 . find the probability that the number on the ticket is (a)the prime number (b)multiple of 4 (c)divisible by 5
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a) probability of prime number=8/20=2/5
b) probability of multiple of 4 =5/20=1/4
c) probability of divisible by 5 =4/20=1/5
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Answer:
(a) 2/5
(b) 1/4
(c) 1/5
Explanation:
(a) The prime numbers from 1 to 20 are - 2, 3, 5, 7, 11, 13, 17, 19
Probability = 8/20 = 2/5
(b) Number of multiple of 4s from 1 to 20 = 20/4
Probability = (20/4)/20 = 1/4
(c) Number of multiple of 5s from 1 to 20 = 20/5
Probability = (20/5)/20 = 1/5
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