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Match each three-variable identity with its expanded polynomial:

A1-A, 2-B, 3-C
B1-B, 2-A, 3-C
C1-C, 2-B, 3-A
D1-A, 2-C, 3-B
Answer & Solution
Correct answer: A. 1-A, 2-B, 3-C
(a+b+c)² expands with all positive pairwise terms. Signs on b and c dictate signs of pairwise products.
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