Range A20:K Lastrow

User will type into B20:J ?? I need to find the last row number that has ANY info and add a formula on each row in column A & K
A: 
ws.Cells(iRow, 1).Formula = "=IF(COUNTIF(G20:G" & CRow & ",G" & CRow & ")>1,"""",1)"
K: 
ws.Cells(iRow, 11).Formula = "=IF($A" & CRow & "=1,Count($A20:A" & CRow & "),"""")"
Where CRow would refer to the current Row like Row()

So: user types info into 3 rows: macro adds formula to each row