Probability for colored balls in urn

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Reference no: EM1399857

An urn contains 8 green balls, 5 red balls, and 7 white balls.

a) How many ways are there to draw a green ball or a red ball?

b) A ball is drawn at random. What is the probability that it is a green ball?

c) How many white balls would you need to add to the urn before you had a 50% or more chance of drawing a white ball?

Reference no: EM1399857

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