What is the probability ?

20 tickets serially numbered from 1 to 20 are mixed and one ticket is taken out randomly. What is the probability that the number on the ticket will be multiple of 3 or 5?

  1. 9/20
  2. 1/2
  3. 2/3
  4. 8/15
Anurag Mishra Professor Asked on 6th September 2015 in Maths.
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1 Answer(s)

Answer: (1) 9/20

Explanation:-
20 tickets serially numbered from 1 to 20 are mixed and one ticket is taken out randomly,
The tickets  will be multiple of 3 and 5 = 3, 5, 6, 9, 10, 12, 15, 18, 20
Then, the number of tickets of the multiple of 3 and 5 = 9
The total number of tickets = 20

Then, the probability of the tickets of the multiple of 3 and 5 = 9/20

Hence, the answer is (1) 9/20.

Anurag Mishra Professor Answered on 10th September 2015.
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