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HMMT 2014 U13

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An auditorium has two rows of seats, with 50 seats in each row. 100 indistinguishable people sit in the seats one at a time, subject to the condition that each person, except for the first person to sit in each row, must sit to the left or right of an occupied seat, and no two people can sit in the same seat. In how many ways can this process occur?

Dataset text NuminaMath olympiads. Quoted with source.

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\binom{100}{50} 2^{49}

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