Question: Alex, Bill, and Chen each, in turn, toss a balanced coin. The first one to throw a head wins. a. What are their respective chances

Alex, Bill, and Chen each, in turn, toss a balanced coin. The first one to throw a head wins.
a. What are their respective chances of winning if each tosses only one time?
b. What are their respective chances of winning if they continue, given a maximum of two tosses each?

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