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n-1nn \dfrac {\ln \left ( n\right) -\ln \left ( n-1\right) } {n-\left ( n-1\right) } .

1+1=2 1 0 0

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1.1.1.1 .

Word1.12.11.1?

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A1+1=2 2-1=1. A2-1=1 1+1=2 A.