Friday, December 4, 2015

binomial coefficients - Power of prime P in $nCr$

How can we determine power of prime $P$ in $C(n,r)$, where $C(n,r)$ denotes the number of combination of $n$ objects taken $r$ at a time. (Also denoted $\binom{n}{r}$ and called a binomial coefficient.)

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analysis - Injection, making bijection

I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...