Problem #111


The Fibonacci numbers are defined by the relations F0 = 0, F1 = 1, and Fn+1 = Fn + Fn−1. The first few Fibonacci numbers are 0,1,1,2,3,5,8,13,21,34,55,89,...

This month's problem is to find the last (i.e. unit) digit of F2007.



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