title: ARRAYFORMULA to SUM previous row column and current row column
body: <p><a href="https://docs.google.com/spreadsheets/d/1wlWqdFwgv90s50iP-bXXBHciyualohj610qFiSatcmQ/edit?usp=sharing" rel="nofollow noreferrer">https://docs.google.com/spreadsheets/d/1wlWqdFwgv90s50iP-bXXBHciyualohj610qFiSatcmQ/edit?usp=sharing</a></p>
  
  <p>Shared the above sheet with example. I want an arrayformula to sum the previous rows column and current row column.</p>