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AMO 2021 – Primary 6 (Grade 6) Question 22

AMO · AMO 2021 – Primary 6 (Grade 6)

Question 22

Adam and Bob toss three fair coins independently. Adam wins if at least two are heads; Bob wins if exactly two are tails. Otherwise neither wins. If $p$ is the probability that neither wins, find $1000p$. Diagram labels: H = heads, T = tails.

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