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Approximately 10% of people are left-handed. If two people are selected at random, what is the probability of the following events?
a. Both are right-handed.
b. Both are left-handed.
c. One is right-handed and the other is left-handed.
d. At least one is right-handed.
6.53 Refer to Exercise 6.52. Suppose that three people are selected at random.
a. Draw a probability tree to depict the experiment.
b. If we use the notation RRR to describe the selection of three right-handed people, what are the descriptions of the remaining seven
events? (Use L for left-hander.)
c. How many of the events yield no right-

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