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B.4log75=³log75/³log4=1+2b/2/a=a+2ab/2
= 2log3 + 2log5
= a +b
b. 2log3 . 3log5 =ab
2log5 = ab
4log75 = 4log()
= 4log + 4log3
= log + log3
= 2/2 2log5 + 1/2 2log3
= ab + 1/2 a
=