loga (ab) = x, then log b (ab) is :  Choose the correct answer:
A) 1/x  B) x/ (x+1)  C) x/(1-x)  D) x/(x-1)  E) x/(x-2)
loga (ab) = x =&gt; log b/ log a = x =&gt; (log a + log b)/ log a = x   1+ (log b/ log a) = x =&gt; log b/ log a = x-1   log a/ log b = 1/ (x-1) =&gt; 1+ (log a/ log b) = 1 + 1/ (x-1)   (log b/ log b) + (log a/ log b) = x/ (x-1) =&gt; (log b + log a)/ log b = x/ (x-1)   =&gt;log (ab)/ log b = x/(x-1) =&gt; logb (ab) = x/(x-1)   ANSWER:x/(x-1)
<result>D</result>
loga (ab) = x, then log b (ab) is :