<PRE>
13 * C<SUP>4</SUP><SUB>3</SUB>
_______ =

C<SUP>52</SUP><SUB>3</SUB>
</PRE>



<PRE>
13 * 4
________ =

22100
</PRE>



<PRE>

1
___ =

425
</PRE>



<PRE>
~ .00235294

</PRE>

Or a 424/1 logshot (0.235294 %)


From rpg



A perhaps easier way to calculate this is as follows. The probability of the second card being the same rank as the first is 3/51 and the odds of the third being the same as the first two is 2/50, and 3/51 * 2/50 = 1/425 or
424 to 1.