Problem:
The two spinners shown are spun once and each lands on one of the numbered sectors. What is the probability that the sum of the numbers in the two sectors is prime?
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Answer Choices:
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Solution:
Make a table.
The table shows that seven of the nine equally likely events have prime numbers for their outcomes. So the probability of a prime outcome is .
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions