$log_340$ is greater.
Work Step by Step
Step 1. $4^2=16\lt 60\lt64=4^3$; thus $2\lt log_460\lt3$ Step 2. $3^3=27\lt 40\lt81=3^4$; thus $3\lt log_340\lt4$ Step 3. We can conclude that $log_340$ is greater.
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