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Excel

ISNA is used in Excel to determine whether a value is equal to, not equal to, less than, or greater than another value. The function takes two arguments: the value you want to test and the value you're comparing it to. The function will return TRUE if the value is equal to, not equal to, less than, or greater than the other value, and FALSE if the values are not equal.

The syntax of the ISNA function in Excel is as follows:

ISNA(value)

The function takes a value as an argument and returns a Boolean value indicating whether the value is an error or not.

ISNA stands for "invalid input string address." It is a function in Excel that can be used to test whether a value is a valid cell reference. This function can be useful in Excel formulas when you are trying to reference a cell that may not exist. For example, if you want to reference a cell in a different worksheet, you can use the ISNA function to test whether the cell reference is valid. If the cell reference is not valid, the ISNA function will return the value "false."

ISNA is not a function that is native to Excel. It is an add-in that needs to be installed separately. It is used to calculate the value of a financial option. It should not be used for other purposes.

There are many similar formulae to ISNA in Excel. Some of these include the IFERROR and ISERROR functions, which both check for errors in a formula. The IF function can also be used to check for certain conditions and return a value based on those conditions. The VLOOKUP function can be used to lookup values in a table, and the SUM function can be used to add together a series of numbers.

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