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Probabilistic Problems in Mathematics Problems of Grade Three.
This is a typical permutation and combination problem.

First of all, this question does not matter about color.

(3 pairs of black+1 dialogue) *2=8.

The combination of a pair is 1 of the left 4 and 1:4 * 4 = 16 of the right 4.

Your two choices are: 8*7=56.

So the probability of getting a pair is:

16/56=2/7

(2/7)*2=4/7, so the probability is 4/7.

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