Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?
Answers
Answered by
33
Multiples of 3 --> 3 ,6, 9 , 12 , 15, 18
Multiples of 5 --> 5,10,15,20
Probability = 9/20
We will not count 15 twice as it is common in both.
Hope it helps
Multiples of 5 --> 5,10,15,20
Probability = 9/20
We will not count 15 twice as it is common in both.
Hope it helps
Answered by
19
n(s) = 20
then {3,5,6,9,10,12,15,18,20}=9
probability=9/20
then {3,5,6,9,10,12,15,18,20}=9
probability=9/20
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