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Show working please. What is the coefficient of a x^12y^12 in the expansion of (3x - 7y)^24? (a) -3^12 7^12 (24 12) (b) (3x)^12(-7y)^12(24 12)

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What is the coefficient of a x^12y^12 in the expansion of (3x - 7y)^24? (a) -3^12 7^12 (24 12) (b) (3x)^12(-7y)^12(24 12) (c) 21^12(24 12) (d) (3x)^12(7y)^12(24 12)

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