Question 538617
A box is filled with 4 red cards, 6 brown cards, and 5 blue cards. A card is chosen at random from the box. What is the probability that it is a red or a blue card?

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P(red or blue) = P(red) + P(blue) = (4/15) + (5/15) = 9/15 = 3/5
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Cheers,
Stan H.