GMAT Quantitative Reasoning Practice Test 4

Question : 62 of 100

Marks: +1, -0

The probability of pulling a black ball out of a glass jar is

1 \/ X

. The probability of pulling a black ball out of a glass jar and breaking the jar is

1 \/ Y

. What is the probability of breaking the jar?

Solution:

Let

Z

be the probability of breaking the jar, therefore the probability of both events happening is

Z ×(1 \/ X)=(1 \/ Y) ⋅ Z=X \/ Y

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