Modular Arithmetic Practice - CMU
Sep 13, 2015 · 12. When 30! is computed, it ends in 7 zeros. Find the digit that immediately precedes these zeros. [Solution: 8] 30!=107 = 226 2314 157 174 711 4132 217 191 23 291=10 = 219 314 7 112 13 17 1 119 231 29 . So, 30! = 219 143 174 1112 1132 17 19 23 291 8 9 1 1 9 7 9 3 9 ( 2) ( 1) ( 1) ( 3) ( 1) 3 ( 1) 18 8 mod 10.
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