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Unformatted text preview: >'.r:' )r"r. r{e., ~ Ye' :. " K,' 10:' ~(l'ffJ :. ~ ~fII'101 y,~ '. I (.' A_ II~tIf}. .. 1'1"'1::. /21, 'D ... /1;y.. . te~ ... r f"j l 2. Say we have an urn consisting of 10 labeled blue balls, 5 labeled red balls and 4 labeled green balls (so that each ball has a different label). (a) In how many ways can we select 10 balls from the urn so that we get exactly 5 blue, 3 red and 2 green? i.to! ::(t;}!)/i) ~ @;!l.? (b) In how many ways can we select 10 balls so that we get either 5 or 6 blue? "::J~ .r' q.,'/ r 0 (~ It; J ..!!'r 4:> , ... .r ," (/11 eI f ,'.le t../ :: e;)'(l) + (~o}(:) ::rfj2iy (c) In how many ways you can select 7 balls so that at least one of them is blue. Do it by making use of t}l(' number of ways of selecting 7 balls ami no blue ones. #'e.li~ ~ &~O~ ~/t.<.t...
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 Spring '08
 Moumen,F
 Probability

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