Question 1021710
<pre>
1,3,27, 243

{{{1=3^0}}}
{{{3=3^1}}}
{{{27=3^3}}}
{{{243=3^5}}}

Those are all powers of 3. The only one of the choices 
that is also a power of 3 is

{{{81=3^4}}}

Edwin</pre>