Originally Posted by
martindwilson
using row() or even column() is a useful method of incrementing something if you put =a1&1 in a cell and dragged down it would simply repeat the 1 so =a2&1, a3&1 and so on so using row returns the row number the formula is in and as it is dragged down it increments. but say you want to go up 1,2,3 and your formula is in row 60 you'd need to take away the 59 to return 1.
so when you see say starting in 21st row =a1&row()-20 that is = a1&1 then dragged down a2&row()-20 is a2&2
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