Possible Duplicate:
Number of ways of spelling Abracadabra in this grid
Determine the number of ways of spelling “mathematics” in the array below by following a path from top to bottom in which each letter is directly below, and just to the right or left of the previous letter.
M
A A
T T T
H H H H
E E E E E
M M M M M M
A A A A A
T T T T
I I I
C C
S