Using Wilson's theorem, find the least positive residue of 8*9*10*11*12*13 modulo 7. I cant really imply "6!=-1(mod 7)" in this question, how do i use it?
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8 mod 7 = 1 9 mod 7 = 2 ... 13 mod 7 = 6 8*9*10*11*12*13 mod 7 = 6! mod 7 = -1
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