Hi,
To check if value appears in a range of cells more than once, twice or certain number of times, you have to use IF and COUNTIF functions with logical operators.
This formula checks if value exists more than once:
=IF(COUNTIF(A5:A15,B5)>1,"Value is included more than once","Value is not included more than once")
And this formula checks if value appears exactly 3 times:
=IF(COUNTIF(A5:A15,B5)=3,"Value is included 3 times","Value is not included 3 times")