Fifteen persons among whom are $A$ and $B$, sit down at random at a round table. The probability that there are $4$ persons between $A$ and $B$, is
Fifteen persons among whom are $A$ and $B$, sit down at random at a round table. The probability that there are $4$ persons between $A$ and $B$, is
- A
$\frac{1}{3}$
- B
$\frac{2}{3}$
- C
$\frac{2}{7}$
- D
$\frac{1}{7}$
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