AMC 12B 2011 Problem 1

Past Contests AMC 12 AMC 12B - 2011
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1

What is

\dfrac{2+4+6}{1+3+5}-\dfrac{1+3+5}{2+4+6} ?

Answer Choices
A. -1
B. \dfrac{5}{36}
C. \dfrac{7}{12}
D. \dfrac{147}{60}
E. \dfrac{43}{3}