Problem
2007 AMC 12A Problem 16
How many three-digit numbers are composed of three distinct digits such that one digit is the average of the other two?
\mathrm{(A)}\ 96\qquad \mathrm{(B)}\ 104\qquad \mathrm{(C)}\ 112\qquad \mathrm{(D)}\ 120\qquad \mathrm{(E)}\ 256
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