Use Pascal's triangle to expand the binomial.(x + 3y)6
A. x6 + 18x5y + 108x4y2 + 486x3y3 + 972x2y4 + 1458xy5 + 729y6
B. x6 + 18x5y + 135x4y2 + 540x3y3 + 1215x2y4 + 1458xy5 + 729y6
C. x6 + 18x5y + 729x4y2 + 60x3y3 + 729x2y4 + 18xy5 + 3y6
D. x6 + 18x5y + 36x4y2 + 54x3y3 + 36x2y4 + 18x y5 + 3y6
Answer: B
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A. 
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