Question 1039348
<pre><b>

(a)   {{{(12!+1)/13=36846277}}}, an integer

(b)   {{{(15!-1)/13=100590335999&12/13}}}, not an integer

(c)   {{{(14!+1)/13=6706022400&1/13}}}, not an integer

Answer: (a) only 

Edwin</pre></b>