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10 September, 12:21

Max has a spinner that lands on 1 with a probability of $/frac{1}{2}$, lands on 2 with a probability of $/frac{1}{4}$, lands on 3 with a probability of $/frac{1}{6}$, and lands on 4 with a probability of $/frac{1}{12}$. If Max spins the spinner, and then Zack spins the spinner, then what is the probability that Max gets a larger number than Zack does?

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  1. 10 September, 13:15
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    If Max lands on 4, then Zack can land on 3, 2, 1. The probability that Zack lands on 3, 2, 1 is 1/6 + 1/4 + 1/2 = 11/12.

    The combined probability of Max landing on 4 and Zack landing on 3, 2, 1 is:

    1/12 * 11/12 = 11/144.

    If Max lands on 3, then Zack can land on 2, 1. The probability that Zack lands on 2, 1 is 1/4 + 1/2 = 3/4.

    The combined probability of Max landing on 3 and Zack landing on 2, 1 is:

    1/6 * 3/4 = 1/8.

    If Max lands on 2, then Zack must land on 1. The probability of this is 1/4 * 1/2 = 1/8.

    If Max lands on 1, then he cannot get a larger number than Zack.

    The overall probability that Max has a larger number than Zack is:

    11/144 + 1/8 + 1/8 = 47/144
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