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A dresser drawer contains five pairs of socks of these colors: blue, brown, green, white, and black. The socks in each pair are folded together. Pinto reaches into the drawer and takes a pair of socks without looking. He wants a black pair.
a) Determine the probability that Pinto takes the black pair of socks on his first try.
b) What is the probability that Pinto takes the green pair of socks on his first and second tries?
c) What assumptions do you make?
A drawer contains 11 identical red socks and 8 identical black socks. Suppose that you choose 2 socks at random in the dark.
a. What is the chance that you get a pair of red socks?
b. What is the chance that you get a pair of black socks?
c. What is the chance that you get 2 unmatched socks?
d. Where did the other red sock go?
Fundamental counting principle: If one event can occur in ways and a second event can occur in ways, the number of ways the two events can occur in sequence is then .
Definition permutation (order is important):
Definition combination (order is not important):
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