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2014-09-14T13:39:14+05:30
Log 60 +log20=log120
logm+logn =logMn

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2014-09-14T13:42:31+05:30

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 Log\ a * b = Log\ a + Log\ b \\ \\ So,\ Log\ 60+Log\ 20 = Log\ 2*2*3*5 + Log\ 2*2*5 \\ \\ = 2 * Log\ 2 + Log\ 3 + Log\ 5 + 2 log\ 2 + Log\ 5 \\ \\ = 4 * Log\ 2 + Log\ 3 + 2*Log\ 5 \\

It is also equal to Log 60 * 20 = Log 1200

2 3 2