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2015-03-25T17:39:10+05:30

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 2^{-x} =  2^{4}

Equating the powers,we get 

-x = 4

x = -4
1 2 1
DONT KNOW..MAY BE....
im sure frnds
OK...THANKS A LOT..
ok thanks.
:)
2015-03-25T18:21:07+05:30
The answer is 4. 2^4=2*2*2*2=16
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