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{\samepage \clearpage $\frac{15}{30} \times 100=50$
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{\samepage \clearpage $\frac{60}{30} \times 100=200$
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{\samepage \clearpage $y$
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{\samepage \clearpage \begin{tabular}{ccccc}
Prize is & Player & Monty Hall & Player & Player \\ 
behind & chooses & opens curtain & switches & wins \\ 
curtain & curtain & & & \\  \hline
1&1&2 or 3 & from 1 to 2 or 3 & No \\ 
1&2&3&from 2 to 1 & Yes \\ 
1&3&2&from 3 to 1 & Yes \\ 
2 & 1 & 3 & from 1 to 2 & Yes \\ 
2 & 2&3& from 2 to 1 or 3 & No \\ 
2&3&1&from 3 to 2 & Yes \\ 
3 & 1 & 2 & from 1 to 3 & Yes \\ 
3 & 2 & 1 & from 2 to 3 & Yes\\ 
3 & 3 & 1 or 2 & from 3 to 1 or 2 & No
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