Question
If `3^(x - y)` = 27 and `3^(x + y)` = 243, then `x` is equal to :
Answer: Option C
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= `3^(x - y) = 3^3 hArr x - y = 3`..........................(i)
= `3^(x + y) = 3^5 hArr x + y = 5` .........................(ii)
On solving (i) and (ii) , we get `x` = 4.
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