13. 17.ticketsnumbered 1 to 20 are mixed up and then a ticket is drawn at random. what is theprobability that the ticket drawn has a number which is a multiple of 3 or 5?
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9/20
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This is a question on probability.
Probability = Number of events / total number of occurrences
The multiples of 3 and 5 between 1 and 20 is :
= for 3 is : 3 ,6 , 9, 12 , 15, 18
For 5 : 5 , 10 ,15 ,20
the probability of getting a multiple of 3 = 6/20
The probability of getting a multiple of 5 = 4/20
The probability of getting either a multiple of 3 or 5 is :
P(multiple of 3) + P( multiple of 5)
= 6/20 + 4/20 = 10/20 = 1/2
= 1/2
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