Michael has 4 red shirts, 3 green shirts, and 5 blue shirts in his closet. If he randomly selects a shirt what is the probability that he chooses blue or red?

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Answer 1 · 2016-11-15T07:59:57

$P(B " or " R) = 3/4$

Michael has 12 shirts altogether.

The probability that he chooses either blue or red means there are 9 shirts which are possible.

$"Probability" = "number of desirable outcomes"/"total number of possible outcomes"$

$P(B " or " R) = 9/12 = 3/4$

Note that the probability of blue or red is the same as the shirt NOT being green. He has 3 green shirts.

$P("Not Green") = 1- P(G)$

= $1-3/12 = 9/12 = 3/4$