Translation of "combinatorial identity" into Chinese

In solving this mathematics problem, we applied a combinatorial identity to simplify the summation of binomial coefficients, making the problem easier to handle. (This example sentence was generated by a large language model.)

在解決這道數學題時，我們運用了組合恆等式來簡化二項式係數的求和過程，使問題變得更容易處理。（這個例句是由大型語言模型生成的。）