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Question Number 141311 by SOMEDAVONG last updated on 17/May/21

$$\mathrm{Show}\mathrm{that},{\mathrm{C}}_{\mathrm{n}}^{\mathrm{k}}+{\mathrm{C}}_{\mathrm{n}}^{\mathrm{k}-1}={\mathrm{C}}_{\mathrm{n}+1}^{\mathrm{n}-\mathrm{k}}$$

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