<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.