In the domino game Mexican
Train, holding a double can be a
problem, since when a double is
played, a second domino of the
same denomination must be played
immediately, or else a domino from
the bone pile must be drawn; and,
if it doesn’t match the double, you
lose control of your train.
The other
night, I was playing Mexican Train
with friends using a double 12 set
(a double 12 set includes every
two number combination from 0-0
through 12-12); and, in picking
a hand of 11 dominos, I got four
doubles.
What is the probability of
this?