Add nCr function to math directory #117
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This PR adds a function to calculate the number of combinations (n choose r) in Kotlin. It handles input validation and efficiently computes the result using an iterative approach. Example tests are included in the main() function.
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This PR adds a function to calculate the number of combinations (n choose r) in Kotlin. It handles input validation and efficiently computes the result using an iterative approach. Example tests are included in the main() function.