Problem:
One fair die has faces and another has faces . The dice are rolled and the numbers on the top faces are added. What is the probability that the sum will be odd?
Answer Choices:
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Solution:
An odd sum requires either that the first die is even and the second is odd or that the first die is odd and the second is even. The probability is
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions