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Question
An urn contains twenty white slips of paper numbered from 1 through 20, ten red slips of paper numbered from 1 through 10, forty yellow slips of paper numbered from 1 through 40, and ten blue slips of paper numbered from 1 through 10. If these 80 slips of paper are thoroughly shuffled so that each slip has the same probability of being drawn. Find the probabilities of drawing a slip of paper that is white and numbered higher than 12 or yellow and numbered higher than 26.
Solution
P(White and numbered higher than 12 or Yellow and numbered higher than 26) = P(White and numbered higher than 12) + P(Yellow and numbered higher than 26)
= `8/80 + 14/80`
= `22/80`
= `11/40`
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