Select the figure which does NOT belong to the group.
By what number should 10 \( \frac{2}{3} \) be divided to obtain 20?
\( \frac{6}{15} \)
\( \frac{7}{15} \)
\( \frac{8}{15} \)
\( \frac{9}{15} \)
Select the figure that does NOT belong in the following group.