how can I match numbers from two columns?

[Guest]

I have two large columns with numbers. I need to check what numbers from
column 2 are already in column 1.
Example:

25 55
20 25 Already in column A
19 42
31 20 Already in column A

That's all I need. A formula in column C that tell me what numbers from
column B are already in column A.
Anny suggestions? Thanks!


Thanks a lot

 

[Aladin Akyurek]

In C2 enter & copy down:

=ISNUMBER(MATCH(B2,$A$2:$A$5,0))+0

A result of 1 means success, 0 failure.