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GMATPrep - value of n

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by deepamohn » Tue Nov 25, 2008 8:29 pm
5^21 * 4^11= 2 * 10^n

5^21 * 2^22 = 2* 2^n * 5^n
5^21 * 2^22 = 2^n+1 * 5^n

n+1=22
n = 21
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