Use the binomial theorem to expand the expression.(a - b)6
A. a6 - 6a5b - 15a4b2 - 20a3b3 - 15a2b4 - 6ab5 - b6
B. -a6 + 6a5b - 15a4b2 + 20a3b3 - 15a2b4 + 6ab5 - b6
C. a6 + 6a5b + 15a4b2 + 20a3b3 + 15a2b4 + 6ab5 + b6
D. a6 - 6a5b + 15a4b2 - 20a3b3 + 15a2b4 - 6ab5 + b6
Answer: D
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