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What is the answer of $$\frac{1}{6} + \frac{1}{12} + \frac{1}{20} + \frac{1}{30} + \frac{1}{42} + \frac{1}{56}$$ ?
$$\frac{11}{24}$$
$$\frac{3}{8}$$
$$\frac{7}{16}$$
$$\frac{13}{28}$$
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