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JEE Mains Model Paper 19

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Question : 35 of 90
 
Marks: +1, -0
For r = 0, 1, ...,10, let Ar,Br and Cr denote, respectively, the coefficient of xr in the expansions of(1+x)10, (1+x)20 and (1+x)30
Then
10
Σ
r=1
Ar (B10Br−C10Ar) is equal to
Validate
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