Sum of Harmonic series: $ 1+\frac {1}{2}+\frac {1}{3} + \frac {1}{4} + \cdots + \frac {1}{50}$

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How to find the sum of this series : $ 1+\frac {1}{2}+\frac {1}{3} + \frac {1}{4} + \cdots + \frac {1}{50}$