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a
(401)4
b
(101)4
c
0
d
(201)4
answer is B.
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Detailed Solution
The given expression is the coefficient of x4 in 4C0(1+x)404−4C1(1+x)303+4C2(1+x)202−4C3(1+x)101+4C4 = Coefficient of x4 in (1+x)101−14= Coefficient of x4 in 101C1x+101C2x2+⋯4=(101)4