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Which list of positive (x, y) pairs has one constant product?

A(2,8), (3,7), (4,6)
B(2,6), (3,9), (4,12)
C(2,6), (3,5), (4,4)
D(2,12), (3,8), (4,6)
Answer & Solution
Correct answer: D. (2,12), (3,8), (4,6)
The products 2 × 12, 3 × 8 and 4 × 6 all equal 24.
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