Probability and Conditional Probability

SAT Math· difficulty 2/5

A bag contains 4 red, 3 blue, and 5 green marbles. What is the probability of drawing a blue marble?

A
$1/2$
B
$1/3$
C
$1/4$
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D
$3/12$

Explanation

P(\text{blue}) = 3/12 = 1/4

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