My First Problem

Algebra Level pending

f(k) = 1+ \(\frac{1}{2}\) + \(\frac{1}{3}\) + \(\ldots\) + \(\frac{1}{k}\).

Find \(\displaystyle\sum_{k=1}^n\) (2k+1)f(k)

For n=11 . Given that f(11)=3

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