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Q.

Let ∫dxx2008+x=1plog⁡xq1+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=log⁡x−12007log⁡1+x2007=log⁡x2007−log⁡1+x20072007=12007log⁡x20071+x2007+Cp+q+r=6021 The sun of digits in p+q+r is 6+0+2+1=9
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Let ∫dxx2008+x=1plog⁡xq1+xr+C where p,q,r∈N and need not be  distinct then the sum of the digits in p+q+r is