Question:If`log_10 2 = 0.30103,`the value of `log_10 5` is : 

A `0.3241` 
B `0.6911` 
C `0.6990` 
D `0.7525` 

+ Answer
C 

+ Explanation
`log_10 5 = log_10 (10/2)`

`= log_10 10 - log_10 2`

`= 1 - log_10 2`

`= (1 - 0.3010)`

`= 0.6990`.

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Irin Moni

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