How to Use the NOT Function in Excel (Invert Logic Easily) The NOT() function in Excel is used to reverse or negate a logical condition. It’s handy when you want to highlight items that don’t match a criteria. 📘 Syntax: =NOT(logical) ✅ Example – Flag non-passing students: =NOT(B2>=40) This returns TRUE if the score is below 40, meaning the student did not pass. 🔗 Combine with IF Function: =IF(NOT(B2>=40), "Fail", "Pass") This displays "Fail" if the score is below 40. 🎯 Use Cases: Highlight customers who haven’t responded Filter out completed tasks Exclude specific conditions from your formula logic 🚀 Pro Tip: NOT is super powerful in dashboards when used with multiple criteria filters. Stay sharp with Excel tricks – follow ScriptDataInsights for daily tutorials and hacks!