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Mathematics 5 Online
OpenStudy (anonymous):

A oersib with $2 in her pocket bets $1, even money. On the flip of a coin, and she continues to bet $1 as long as she has any money. Draw a tree diagram to show the various things that can happen during the first four flips of the coin. after the fourth flip of the coin, in how many of the case will she be (a) exactly even (b) exactly $2ahead?

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