Answer
$1$
Work Step by Step
$\because \log_a M-\log_a N = \log_a\left(\dfrac{M}{N}\right)$
$\therefore \log_6 18 - \log_6 3 = \log_6 \left(\dfrac{18}{3}\right) = \log_6 6$
$\because \log_a a = 1$
$\therefore \log_6 6 = 1$
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