Evaluate the Binomial Coefficient Given two nonnegative integers n,k such that 0 &lt;= k &lt;= n, return the binomial coefficient 

c(n,k) := (n!) / (k! * (n-k)!)


Test cases

Most languages will probably have a built in function.

c(n,0) = c(n,n) = 1 for all n
c(n,1) = c(n,n-1) = n for all n 
c(5,3) = 10
c(13,5) = 1287


Related challenges

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JavaScript (ES6), 27 bytes
f=(n,k)=&gt;k?n*f(n-1,k-1)/k:1