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by nithi_mystics » Wed Sep 22, 2010 7:46 am
5^21 * 4^11 = 2 * 10^n

LHS :

5^21 * 4^11
= 5^21 * 2 * 2* 4^10
= 5^21 * 2 * 2* (2*2)^10
= 5^21 * 2 * 2* 2^10 *2^10
= 5^21 * 2 * 2^21
= 2* 5^21* 2^21
= 2* 10^21 ==> n =21
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Nithi
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