USE EXCEL

You are entering employee names in the cell range A1:A10. Use data validation to ensure that no employees name is entered more than twice. Hint: Use the Custom setting and the COUNTIF function.

USE EXCEL

Suppose you want every entry in the cell range B2:B15 to contain text and not a numerical value. Use data validation to ensure that entering a numerical value returns an error. Hint:Use the ISTEXT function.