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5^21 x 4^11 = 2 x 10^n n=

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5^21 x 4^11 = 2 x 10^n n= [#permalink] New post 26 Feb 2007, 10:49
5^21 x 4^11 = 2 x 10^n

n=?
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 [#permalink] New post 26 Feb 2007, 11:15
Similar to this one : http://www.gmatclub.com/phpbb/viewtopic.php?t=42550 :)

5^21 x 4^11 = 2 x 10^n
<=> 5^21 x 2^22 = 2 x (5*2)^n
<=> 5^21 x 2^22 = (5)^(n) * (2)^(n+1)
=> n=21
  [#permalink] 26 Feb 2007, 11:15
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5^21 x 4^11 = 2 x 10^n n=

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