# Concept derivation guides

299 concept teaching guides, separate from the 36,000 individual question derivations.

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Concept guide



## [Complete inverse pairing and both Wilson directions](/en/derivations/derivation-mko-wilson-theorem-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-wilson-theorem)

For n>1, (n-1)!=-1 mod n exactly when n is prime; the full modulo-7 inverse table checks 6!=6 mod 7.

Wilson theorem

derivation-mko-wilson-theorem-01





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