When using the Custom data validation type, you can use a formula that evaluates to either true or false.

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When using the Custom data validation type, you can use a formula that evaluates to either true or false, allowing you to specify custom validation criteria for the data entered in that cell. If the formula evaluates to true, the data is valid, and if it evaluates to false, an error message will be displayed.

When Using the Custom Data Validation Type, You Can Use