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Questions  

The coefficient of X53 in the following expansion

m=0100100Cm(x3)100m2m is 

a
100C47
b
100C53
c
−100C53
d
−100C100

detailed solution

Correct option is C

The given sigma expansion ∑m=0100 100Cm(x−3)100−m⋅2m Can be written asx-3+2100=(x−1)100=(1−x)100∴ Coefficient of x53 in (1−x)100=(−1)53100C53=−100C53

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