Draw Poker Pair vs. Pair contests

[four-flush]

How do I calculate the probability that a pair will win <font color="red"> </font> in a showdown against another pair. For instance, the probability that a player who holds AAxxx pre-draw of winning in a showdown against a player who holds JJxxx pre-draw is different to KKxxx vs. JJxxx.

What is the formula/procedure to use to calculate the probability?

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