# In the following figure:A B C D E F G H I
Each of the digits 1, 2, 3, 4, 5, 6, 7, 8, and 9 is:
a) Represented by a different letter in the figure above.
b) Positioned in the figure above so that each of A + B + C,C + D +E,E+ F + G, and G + H + I is equal to 13.
Which digit does E represent?