In a jar, there are 50 marbles. If 1/5 of these marbles are blue, 1/4 of the remaining marbles are red, and there are 12 green marbles. What is the probability that a randomly selected marble will not be blue, red, or green?

Answer Choices

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1/5

2/5

3/10

7/25

9/25

Correct

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Official Explanation

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In the jar, there are 50 marbles, and 1/5 of them are blue. Calculating this gives us 1/5 of 50 = 10 blue marbles. After accounting for the blue marbles, we have 50 - 10 = 40 marbles left. Now, 1/4 of these remaining marbles are red, which is 1/4 of 40 = 10 red marbles. Additionally, we know there are 12 green…

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Comments

MohitMar 26, 2025

Greatt

ShimantaJun 15, 2024

Thanks for sharingThank you for sharing!!thanks for sharing

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.