Problem:
A board game spinner is divided into three regions labeled and . The probability of the arrow stopping on region is and on region is . The probability of the arrow stopping on region is
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Answer Choices:
A.
B.
C.
D.
E.
Solution:
Since the sum of the three probabilities is , the probability of stopping on region is .
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions