GMAT Quantitative Reasoning Practice Test 4

Question : 61 of 100

Marks: +1, -0

1 In jar A there are 3 white balls and 2 green ones, in jar B there is one white ball and three green ones. A jar is randomly picked, what is the probability of picking up a white
ball out of jar A?

$2/5$
$3/5$
$3/10$
$3/4$
$2/3$

Validate

Solution:

The probability of picking the first jar is

1 / 2

, the probability of picking up a white ball out of jar

{\A}

3 /(3+2)=3 / 5

. The probability of both events is

1 / 2 × 3 / 5=3 / 10

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