Probability - Arithmetic Aptitude Questions and Answers

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Discussion :: Probability

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?

$\frac { 1 } { 2 }$

$\frac { 2 } { 5 }$

$\frac { 8 } {15 }$

$\frac { 9 } { 20 }$

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Answer : Option D

Explanation :

Here, S = {1, 2, 3, 4, ...., 19, 20}.

Let E = event of getting a multiple of 3 or 5 = {3, 6 , 9, 12, 15, 18, 5, 10, 20}.

P(E) = $\frac { n(E) } { n(S) }$ = $\frac { 9 } { 20 }$

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