in a bag of 20 marbles, 4 are blue. what is the probability that one taken at random will not be blue?
2 answers:
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You want to isolate C, so the first step would to have it be positive. You would do this by adding C to both sides of the equation to cancel the C on one of the sides out like this:
. Then you want to cancel out the P, so you subtract it on both sides like this:
And that is your answer
. Then you want to cancel out the P, so you subtract it on both sides like this:
And that is your answer