How do you calculate $Log_7 15$ ?

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Answer 1 · 2016-06-14T12:44:49

$log_7 15=1.39167$

As $log_abxxlog_bc=log_ac$

$log_bc=log_ac/log_ab$

Hence $log_7 15=log15/log7=1.1761/0.8451=1.39167$

How do you calculate Log_7 15 Log_7 15 ?