ISLOGICAL
Tests if a cell contains a logical value, TRUE or FALSE.
Syntax:
ISLOGICAL(value)
Returns TRUE if value is either TRUE or FALSE, and FALSE otherwise.
Example:
ISLOGICAL(D5)
where D5 contains FALSE, returns TRUE, because D5 contains a logical value.
ISLOGICAL(123)
returns FALSE, because 123 is a number, not a logical value.
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