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COUNTBLANK
The COUNTBLANK function returns the number of cells in a collection that are empty.
COUNTBLANK(range)
range: A collection consisting of a reference to a single range of cells.
Examples  | 
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The information in the following table is not meaningful, but is useful to illustrate the type of arguments COUNTBLANK includes in its result. Given the following table:  | 
A  | B  | C  | D  | |
|---|---|---|---|---|
1  | 100  | 200  | 300  | 400  | 
2  | lorem  | ipsum  | dolor  | sit  | 
3  | 100  | 200  | 300  | sit  | 
4  | TRUE  | TRUE  | FALSE  | FALSE  | 
5  | 200  | 400  | ||
6  | 
=COUNTBLANK(A1:D1) returns 0 because there are no blank cells in the collection referenced by the range. =COUNTBLANK(A2:D2) returns 0 because there are no blank cells in the collection referenced by the range. =COUNTBLANK(A5:D5) returns 2 because there are two blank cells in the collection referenced by the range. =COUNTBLANK(A6:D6) returns 4 because there are only blank cells in the collection referenced by the range. =COUNTBLANK(A1:D6) returns 6 because there are a total of 6 blank cells in the collection referenced by the range. =COUNTBLANK(A1:D1, A5:D5) returns an error because COUNTBLANK accepts only one collection as an argument.  | 
Example — Survey results  | 
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To see an example of this and several other statistical functions applied to the results of a survey, see the COUNTIF function.  |