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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 red or yellow and numbered 1, 2, 3 or 4
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Solution
P(Red or yellow and numbered 1, 2, 3 or 4)
= P(Red numbered 1, 2, 3 or 4) + P(Yellow numbered 1, 2, 3 or 4)
= `4/80 + 4/80`
= `8/80`
= `1/10`
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