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22. Alternate angles

23. 4: ([tex]h_{b} = 2 \frac{a}{b}[/tex], substitute b with 10 and a with 20 and you get 4.)

24. 0.28: 0.12 + 0.60 = 0.72. Probability is always out of 1, so 1 - 0.72 should give you the probability of losing, which is 0.28. 

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