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= 2/5 . log 15
= 2/5 . log (5 . 3)
= 2/5 (log 5 + log 3)
= 2/5 (log (10/2) + log 3)
= 2/5 (log 10 - log 2 + log 3)
= 2/5(1 - a + b)
= (-2a + 2b + 2) / 5