Let ∫dxx2008+x=1plogxq1+xr+C where p,q,r∈N and need not be distinct then the sum of the digits in p+q+r is
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a
8
b
9
c
7
d
2
answer is B.
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Detailed Solution
I=∫1.dxxx2007+1dx=∫1x−x20061+x2007dx=logx−12007log1+x2007=logx2007−log1+x20072007=12007logx20071+x2007+Cp+q+r=6021 The sun of digits in p+q+r is 6+0+2+1=9