Through April 30 of the 1999 filing season, 13.7% of all individual U.S. tax returns were prepared

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Through April 30 of the 1999 filing season, 13.7% of all individual U.S. tax returns were prepared by H&R Block.

a. If two individuals are randomly selected from those filing tax returns during this period, what is the probability that both of their tax returns were prepared by H&R Block?
b. In part (a), what is the probability that neither return was prepared by H&R Block? 

c. In part (a), what is the probability that exactly one of the two returns was prepared by H&R Block?

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