A bag contains 5 white marbles, 7 red marbles, 4 black marbles and 2 blue marbles. One marble is drawn at random from the bag. What is the probability that the marble drawn is white or black?
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Step-by-step explanation:
when the question asks for "or" then you have to add the probabilities
p= 4/18 + 5/18
=9/18=1/2
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