All Test Prep Aspirants, Sooner or Later you will see (or you already did) Wilson's Theorem** Did you know, it was stated by Wilson and his students but nor he nor his students could prove it.
♛ It was "JOSEPH LOUIS LAGRANGE", who proved Wilson's Theorem in 1771. The same Lagrange who gave famous "Lagrange theorem" \___0//
**Wilson's theorem: A natural number n > 1 is a prime number if and only if
(n-1)! mod n = -1
or (n − 1)! + 1 is always a multiple of n.
(25 January 1736 – 10 April 1813)
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