Answer
$ A+C $
Work Step by Step
$\log_{b}6=\log_{b}(2\cdot 3)$
...apply the Product Rule: $\quad \log_{b}(MN)=\log_{b}\mathrm{M}+\log_{b}\mathrm{N}$
$=\log_{b}2+\log_{b}3$
... use the definitions of A and C
$=A+C $
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