432
194
144
108
Correct answer is A
(3x+4)4=4C0(3x)0(4)4+4C1(3x)1(4)3+4C2(3x)2(4)2+4C3(3x)3(4)1+4C4(3x)4(4)0
x3=4C3(3x)3(4)=4!3!1!×33×4
= 432x3
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