Rowing Reshuffle | PuzzledQuant

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A rowing club has 13 two-person boats, so each of its 26 members has a regular boat partner. At the season opener all 26 rowers are drawn into 13 new pairs, with every possible way of pairing up the 26 rowers being equally likely.

What is the expected number of regular crews (original partner pairs) that end up rowing together again? Give the answer as an exact fraction or decimal.