Free Practice Question
PS · Problem Solving
sub-505
Probability
In a set of 60 tickets numbered from 1 to 60, one ticket is randomly selected. What is the probability that the selected ticket number is a multiple of 3 or 4?
Answer Choices
Correct answer marked belowA
1/12
1/2
Correct
C
5/12
D
11/20
E
3/5
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Explanation
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Official Explanation
Official
To solve this, we first count the numbers divisible by 3 from 1 to 60, which is 20. Next, we count the numbers divisible by 4 from 1 to 60, which is 15. Since the multiples of both 3 and 4 (which…
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Comments
2
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M
markJan 19, 2025
This is exactly what I needed to practice
V
VarshiniNov 16, 2024
thanks a lot
What this question tests
What it tests
Your ability to compute probabilities of single and compound events, including 'at least one' questions.
Common trap
Forgetting to use the complement for 'at least one', or treating dependent events as independent.
Details
Difficulty
sub-505
Type
PS
Category