Question:If`log_2 [log_3 (log_2 x)] = 1,` then x is equal to : 

A `512` 
B `128` 
C `12` 
D `0` 

+ Answer
A 

+ Explanation
`log_2 [ log_3 (log_2 x)] = 1`

`= log_2 2`

`⇔ log_3 (log_2 x)`

`= 2 ⇔ log_2 x`

`= 3^3 = 9 ⇔ x = 2^9`

`= 512.`

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Irin Moni

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