# It took me a while to solve this!

**Discrete Mathematics**Level 5

\[\large \sum_{k=0}^{m} \,\,\large \frac{{2n-k}\choose{k}}{{2n-k}\choose{n}} \cdot \ \frac{2n-4k+1}{2n-2k+1} \cdot \,2^{n-2k} \]

Given that \(n\) is a positive integer and \(m\) and \(n\) are non-negative integers such that \(m \,\leq\, n\), which of the given option is the closed form expression of given summation above.