Problem:
The number in each box below is the product of the numbers in the two boxes that touch it in the row above. For example, . What is the missing number in the top row?
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Answer Choices:
A.
B.
C.
D.
E.
Solution:
The product of the two numbers in the second row is , so the missing number in that row is . The product of with the missing number in the top row is , so the missing number in the top row is .
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions