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a
−18x3y3
b
18x3y3
c
9x3y3
d
-9x3y3
answer is A.
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Detailed Solution
(a-b)n=nC0anb0-nC1an-1b1+nC2an-2b2-……..+(-1)nnCna0bn Put a=3x, b=y36,n=43x-y364=4C0(3x)4y360-4C1(3x)3y361+4C2(3x)2y362-…….2nd term =-4C133x3y36=-4×276x3y3=-18x3y3