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Formula for counting blank cells in a column of numbers is COUNTBLANK(range)
The COUNTBLANK function syntax has the following arguments:
Range Required. The range from which you want to count the blank cells.
Example: =COUNTBLANK(A2:B4)
Source: https://support.microsoft.com/help/6a92d772-675c-4bee-b346-24af6bd3ac22
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