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Unformatted text preview: of Aces dealt? 4. In how many ways can 20 cookies and 30 jellybeans be distributed to 4 boys and 5 girls if every boy gets at least 2 cookies, and every girl gets at least 1 cookie and at least 3 jellybeans? 5. Seven light bulbs are selected at random from a set of 20 light bulbs of which 4 are defective. What is the probability that exactly two of the selected bulbs are defective? 6. Let A = (12345) and B = (13)(254) be two permutations on [5] = { 1 , 2 , 3 , 4 , 5 } . Which composition is equal to (1543)(2)? (a) A B ; (b) B A ; (c) B A B ; (d) A B A ; (e) none of the above. Note: X Y means that you apply Y rst, and then X . 2...
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 Spring '07
 Graham
 Algorithms

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