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Applied Math 40S Slides Mar 7, 2007

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Probability practice problems ...

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Applied Math 40S Slides Mar 7, 2007

1. 1. More Practice An examination consists of thirteen questions. A student must answer only one of the first two questions and only nine of the remaining ones. How many choices of questions docs the student have’? WA that B ,7, —'- + L‘. -_I2-1-.55_~1°£'. S.°. ‘./ .2 = l"l‘lsr<: «I .9_nCi’ | =2 —-3 l. ,_C, } . , 9 s i 1 _iC| ’|"2 '<'>TX‘iI‘ >39 1 - '3
2. 2. Randomly arranged on a bookshelf are 5 thick books, 4 medium—sized books, and 3 thin books. What is the probability that the books of the same size stay together? To answer this we break the question down into 3 questions in other words this is how we think about it
3. 3. _ Randomly arranged on a bookshelf are 5 thick books, 4 medium—sized books, and 3 thin books. How many ways can the 12 books be arranged on a shell‘? :2! R (si7E_i: § :2 DJ How many ways can books of the same size V ge er. ’ ‘.2. 3 / sllfs. ls. ’-14-3!) ZWZD What is the probability that the books of the same size stay togethe ? 7>(S‘4"'*' 3426 mt»/ <-3) = (3