1975 AMC 12 Question 19
AMC12 · 1975 AMC 12
Which positive numbers $x$ satisfy the equation $(\log_3x)(\log_x5)=\log_35?$
$3$ and $5$ only
$3,$ $5$ and $15$ only
only numbers of the form $5^n\cdot3^m,$ where $n$ and $m$
are positive integers
all positive $x\ne1$
none of these