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Why two Integrate results of same eq. are different?


Dear all,

I got very extraordinary results today from below two same integrals
except one is symbolic one and the other is numeric one:
A. In[1]= N[Integrate[ Log[2, 1 + 10*x]*Exp[-x]*x, {x, 0, Infinity}]]
    Out[1]= -3.77002
B. In[2]= NIntegrate[ Log[2, 1 + 10*x]*Exp[-x]*x, {x, 0, Infinity}]
    Out[2]= 4.05856

Why did I got the different results of these, surprisingly?

Thank you in advance!

---
Sung Jin Kim
A member of MCL in SNU: kimsj at mobile.snu.ac.kr,
A MTS of i-Networking Lab in SAIT: communication at samsung.com



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