Math CentralQuandaries & Queries


Subject: probability
Name: Carl
Who are you: Other

four red balls numbered 1 thru 4 and three blue balls numbered 3 thru 5 placed in a bag. a ball is drawn from the bag. find the probability of choosing a red or 5 ball.

Hi Carl.

There are seven balls in all. There are only two balls that don't have a 5 and are not red. So 1 - 2/7 = 5/7.

Hope this helps,
Stephen La Rocque.

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