Expand using the binomial theorem.(x - 1)6
A. x6 - 6x5 +15x4 - 20x3 + 15x2 - 6x + 1
B. x6 - 6x5 +30x4 - 120x3 + 30x2 - 6x + 1
C. x6 - 6x5 - 15x4 - 20x3 - 15x2 - 6x - 6
D. x6 - 6x5 - 30x4 - 120x3 - 360x2 - 720x + 720
Answer: A
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