Difficult
If the number of $5$-element subsets of the set $A = \{a_1, a_2, \dots, a_{20}\}$ of $20$ distinct elements is $k$ times the number of $5$-element subsets containing $a_4$,then $k$ is
- A$5$
- B$\frac{20}{7}$
- C$4$
- D$\frac{10}{3}$
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