a quick math challenge
|
12-31-2013, 05:38 PM
Post: #15
|
|||
|
|||
RE: a quick math challenge
(12-31-2013 03:03 PM)Curlytop Wrote: Can anybody explain why this works for 7 (and 13)?\[ \begin{align} 1000&\equiv&6 (7) \\ &\equiv&-1 (7) \\ \end{align} \] \[ \begin{align} 1000&\equiv&12 (13)\\ &\equiv&-1(13) \\ \end{align} \] \[ \begin{align} 123,456,789&=&123\times1000^2+456\times1000+789 \\ &\equiv&123\times(-1)^2+456\times(-1)+789 (7) \\ &\equiv&123-456+789 (7) \\ \end{align} \] Cheers Thomas |
|||
« Next Oldest | Next Newest »
|
User(s) browsing this thread: 1 Guest(s)