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2. 5 log 10+ 5 log 50 - 5 log 4 = 5 log (10.50) - 5 log 4
= 5 log (500/4)
= 5 log 125
= 3 (a)
3. 3 log 4 - 3 log 6 - 3 log 2 = 3 log (4/6) - 3 log 2
= 3 log ((2/3) / 2 )
= 3 log (1/3)
= -1 (e)