Excel’s COUNTBLANK function counts the number of blank cells in a range of cells. You can use it to quickly count the number of empty cells, or to check if a range is completely empty.

Here’s how to use the COUNTBLANK function:

- In a cell, type the following formula:
`=COUNTBLANK(range)`

- Replace
`range`

with the cell range that you want to count the blank cells in. For example, if you want to count the blank cells in a table that starts in cell A1 and goes to cell C10, you would type`A1:C10`

. - Press Enter to see the result. The cell will display the number of blank cells in the specified range.

Here’s an example of the complete formula: `=COUNTBLANK(A1:C10)`

This formula would count the number of blank cells in the range A1:C10.

You can also use the COUNTBLANK function with an array constant, which is a set of values enclosed in curly braces {}. For example:

`=COUNTBLANK({1,2,3;4,5,6;7,8,9})`

This formula would count the number of blank cells in the array constant, which is 0.

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