How do you find matching numbers in column in Excel? [closed]

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I have A and B columns in Excel, if the number is in both the columns, I want to write note "Exist" in columns C automatically, in the row that the value appears in column B.

Example:

A   |  B | C 
1   |  2 | Not Exist
3   |  4 | Not Exist
5   |  1 | Exist
6   |  7 | Not Exist

Answer 1

Use the simple formula COUNTIF

Put this in C1

=IF(COUNTIF(A:A,B1)>0,"Exists","Doesn't Exist")