−540x3y3
−540x4y2
−27x3y3
540x4y2
Correct answer is A
Listing out in order, the terms of this expansion have coefficients: 6C6,6C5,6C4,6C3,6C2,6C1,6C0
The 4th term = 6C3(3x)3(−y)3=20×27x3×−y3
= −540x3y3.
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