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How to calculate: [ \sum _{k=0}^{n-m} \frac{1}{n-k} {n-m \choose k} ].$$\sum _{k=0}^{n-m} \frac{1}{n-k} {n-m \choose k}.$$
How to calculate: [ \sum _{k=0}^{n-m} \frac{1}{n-k} {n-m \choose k} ].
How to calculate: $$\sum _{k=0}^{n-m} \frac{1}{n-k} {n-m \choose k}.$$
