In the circular region with center 0, shown above, the two unshaded sections comprise \(\frac{3}{7}\) and

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Source: GMAT Paper Tests
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In the circular region with center 0, shown above, the two unshaded sections comprise \(\frac{3}{7}\) and \(\frac{1}{3}\) of the area of the circular region. The shaded section comprises what fractional part of the area of the circular region?

A. \(\dfrac{3}{5}\)

B. \(\dfrac{6}{7}\)

C. \(\dfrac{2}{21}\)

D. \(\dfrac{5}{21}\)

E. \(\dfrac{16}{21}\)

The OA is D