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OpenStudy (anonymous):
You toss 3 coins. What is the probability that you get exactly 3 heads, given that you get at least one head? A tree diagram will help you to answer this question.
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OpenStudy (anonymous):
List the possible outcomes. HHH is a possible outcome because it has at least one head. TTT is not a possible outcome because it does not have at least one head.
OpenStudy (anonymous):
|dw:1334164787720:dw| you seem to have 8 paths begging from one, and one of them will give you HHH. so probability is 1/8
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