Four cards are randomly selected from a pack of $52$ cards. If the first two cards are kings, what is the probability that the third card is a king?

1. $\dfrac{4}{52} \\$
2. $\dfrac{2}{50} \\$
3. $\left ( \dfrac{1}{52}\right )\times\left ( \dfrac{1}{52}\right ) \\$
4. $\left ( \dfrac{1}{52}\right )\times\left ( \dfrac{1}{51}\right )\times\left ( \dfrac{1}{50}\right )$