what is the probabilty of 2 blank 6 sided dice

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A person has two blank 6-sided dice. They have 2 of every number (1 – 6) available to randomly distribute on the faces of the dice. Considering all possible combinations, what is the probability of rolling a seven?

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There are twelve digits to be randomly distributed.   Every one of them has two sevens-complements.

Imagine rolling the dice and somehow without looking at the digits showing, point to one of them.

Now ask: What it the probability that the other digit showing is one of its two sevens-complements?