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This formula searches through the A column for the B1 value. If it doesn't find anything (COUNFIF is equal to 0) means the B1 is in B but missing in A. It will write the B1 value in the C1 cell. Otherwise it will leave the cell empty.

Copy this formula in the entire C column. You will probably have to replace ; with an ordinary comma but in Excel 2003 it works only with ;

You can do it the other way around in column D to see if some values from A are in A but not in B. =IF(COUNTIF(B:B;A1)=0;A1;"")

In column A, your number

In colunm B, their number

in column C

=IF(ISBLANK(A2)," ",VLOOKUP(A2,B$2:B$34,1,FALSE))

in column D

=IF(ISBLANK(B2)," ",VLOOKUP(B2,A$2:A$34,1,FALSE))

change the $34 to be how many rows you are comparing.

The isblank function is there to stop the comparison if the source cell is empty.

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