Question:The value of log`5` (1/125) is : 

A `3` 
B `- 3` 
C `1/3` 
D `- 1/3` 

+ Answer
B 

+ Explanation
Let log`5 (1/125) = m`

Then,`5m = 1/125 ⇔ 5^m`

`= 1/5^3 ⇔ 5^m`

`= 5-3`

`:. m = - 3` and log`5(1/125)`

`= -3`

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Irin Moni

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