Answer
$\frac{1}{8}$
Work Step by Step
$\frac{7}{8} * \frac{3}{21} = \frac{7}{8} * \frac{1}{7} * \frac{3}{3} = \frac{7 * 1}{8 * 7} = \frac{1}{8} * \frac{7}{7} = \frac{1}{8}$
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