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jmc

counting and probability junior

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:
(A)
(B)
(C)
(D)
Solution
Since the arrow must land in one of the three regions, the sum of the probabilities must be 1. Thus the answer is .
Final answer
B