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4log 15 = log 15 per log 4
= log 3.5 per 2 log 2
= log 3 + log 5 per 2. b/2 log3
= log 3 + 1/a log 3 per b log 3
= log 3 ( 1 + 1/a) per b log 3
= (1 + 1/a ) per b
=( (a+1)/a ) per b
= (a + 1) per ab
3log4 b b ab