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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 numbered 5, 15, 25, or 35
Solution
P(Numbered 5, 15, 25 or 35)
= P(5) + P(15) + P(25) + P(35)
= P(5 of White, Red, Yellow, Blue) + P(15 of White, Yellow) + P(25 of Yellow) + P(35 of Yellow)
= `4/80 + 2/80 + 1/80 + 1/80`
= `8/80`
= `1/10`
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