Question 1072328
Three cards are drawn from a standard deck w/out replacing them.
a.) what is the probability that they are all face cards?
Ans: 12C3/52C3 = 0.0100
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b.) what is the probability that they are all from the same suit?
Ans: 4*13C3/52C3
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3. A pair of fair dice are rolled. Write down 6 by 6 sample space and find the probability that the sum of the #'s showing is 8 or 9.
8's:: 5 combinations
9's:: 4 combinations
Ans: (5+4)/36 = 1/4
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4. 40% of the students in a school take English, 30% take math, and 25% take both math & English. A student is picked at random, what is the probability that they take Math or English?
P(m OR e) = P(m)+P(e)-P(m AND e) = 0.3+0.4-0.25 = 0.45
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Cheers,
Stan H.
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