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In mathematics, the logarithm of a number is the exponent to which another fixed value, the base, must be raised to produce that number. 

For example
log(base e) *1

=> e^0 =1

log(base e) * 1= 0 

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not understood??
understood.. :)
then y one star??
is it your exam tomorrow?
In general, if a raise to the power n equal to x, we write it as logx to the basea =n where x and a are postive numbers and not= 1

in eponential form 4 raise to power 2 =16
in logarithamic form log 16 to the base 4 =2
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