When Excel cannot calculate a formula what happens?

When Excel cannot calculate a formula, it typically displays an error message, such as #DIV/0!, #VALUE!, or #REF!, indicating the type of issue encountered. These errors can arise from various issues, including division by zero, invalid data types, or references to deleted cells. Excel will not return a value for the formula until the error is resolved. Additionally, the formula will remain intact, allowing users to troubleshoot and correct the underlying problem.