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Excel LOG Function

Excel LOG function

The Excel LOG function returns the logarithm of a given number, using a supplied base. The base argument defaults to 10 if not supplied.

Get the logarithm of a number
Return value 
The logarithm
=LOG (number, [base])
  • number - Number for which you want the logarithm.
  • base - [optional] Base of the logarithm. Defaults to 10.
Usage notes 

The LOG function allows you to get the logarithm of a number with a specified base.

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