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The equation p^2 + 2pq + q^2 = 1 is the binomial expansion of:
A(p-q)^2
B2(p+q)
C(p+q)^2
D(p+q)^3
Answer & Solution
Correct answer: C. (p+q)^2
Squaring (p+q) gives p^2 + 2pq + q^2, and since p+q = 1 the sum equals 1.
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