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This function returns the natural logarithm of the specified number.
LN(value)
[Required] The positive real number for which you want the natural logarithm.
This function is the inverse of EXP, so LN(EXP(x)) is x.
LN(B3)
LN(R1C2)
LN(10) gives the result 2.302585093
LN(exp(1)) gives the result 1