My Version of Pascal's Triangle

The above picture shows the first six rows of my version of Pascal's Triangle. The basic rules apply, but the first and last term for all \(n^{\text{th}} \) equals to \(n-1\).

Let \(f(n)\) denote the sum of the entries in the row that begins with \(n\).

What is the value of \( \frac {f(100)}{f(50) } \bmod {25} \)?

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