Two dice are rolled. Both have six sides labeled 1 through 6, inclusive, but the second die is not fair. (The first one is.) The probability of the second die landing on the side with k dots is ?/21. What is the probability of rolling a sum of 9 when these two dice are rolled?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Two dice are rolled. Both have six sides labeled 1 through 6, inclusive, but the second die is not fair. (The first one is.) The probability of the second die landing on the side with k dots is ?/21. What is the probability of rolling a sum of 9 when these two dice are rolled?

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