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Problem of the Day #222: INVersIoNs, iNveRsIoNS, InVeRsIoNs October 27, 2011

Posted by Albert in : potd , trackback

Bessie the Cow is given a sequence of numbers $1 \ldots 10$ and is told she can do a swap of a pair of numbers in that sequence $5$ times. Dessie, Bessie’s friend, has to guess the sequence after Bessie has applied the inversions. Find Dessie’s chance of being correct.

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