Hi, I need some help on this problem: Prove that $\displaystyle \binom {n+1} {k} = \binom {n} {k-1} + \binom {n} {k} $ any help will be appreciated, thanks.
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You know that $\displaystyle \binom nk=\frac{n!}{(n-k)!k!},$ apply that to the RHS.
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