How could you insert a new row between rows 20 and 21?

To insert a new row between 20 and 21 - Right-click row 21's row number, and then click Insert.The general rule for inserting a column is: select the column, select Home > Insert >  Insert Sheet Columns. Using the keyboard you can do the following: With a single cell selected, hit Control + Shift + + (Plus Sign) to insert a row.

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