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What is the probability that the ticket drawn has a number which is a multiple of 3 or 7 ?

+1 vote
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Ticket numbered from 1 to 20 are mixed up and a ticket is drawn at random.
What is the probability that the ticket drawn has a number which is a multiple of 3 or 7 ?

posted Jul 1, 2015 by Samardeep Acharya

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3 Solutions

+2 votes
 
Best answer

multiples of 3
3 6 9 12 15 18

multiples of 7
7 14

all possible outcomes 6+2=8

probability= 8/20
=2/5

solution Jul 1, 2015 by Sunil Bajpai
0 votes

From 1 to 20 numbers divisible by 3 are 6 by 7 are 2.
So, favourable outcomes are 8 out of a possible 20 outcomes
Probability = favourable outcomes / possible outcomes
= 8/20 = 2/5 = 0.4

solution Nov 8, 2015 by Naveen Chopra
0 votes

p(E) = 8c1 / 20c1 = 8/20.....

multiples of 3= 3 , 6 , 9 , 12 ,15 , 18..

multiples of 7 = 7 , 14,,,,,

solution Mar 14, 2016 by Ajay Kumar Topno



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