Lookup formula limitation? wrote:
I have 160 number in column A and 160 numbers in Column B.....

Lookup let me to compair only 80?
=lookpu(A1,{1,2,3,4,5.........160},{10,20,30,..... .......1600})

How come excel let me do up to 80, not 160?

Dunno. Just curious, why use arrays instead of ranges?