Question:If` (a/b)^(x - 1) = (b/a)^(x - 3)` then x is equal is : 

A 1 
B `1/2` 
C `2` 
D `7/2` 

+ Answer
C 

+ Explanation
`(a/b)^(x - 1) = (b/a)^(x - 3) <=>(a/b)^(x - 1) = (a/b)^(3 - x)`

`:. x - 1 = 3 - x or 2x = 4 or x = 2`

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Irin Moni

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