Math Problem of the week#4
by Keith50, May 15, 2021, 2:14 AM
Math Problem of the week#4 wrote:
Determine all numbers 
such that 
.
,
.
,
,![\[n\equiv 2n^2 \ ( \textrm{mod} \ 9 ) \implies n\equiv 0 \ ( \textrm{mod} \ 9 ) \ \textrm{or} \ n\equiv 5 \ ( \textrm{mod} \ 9 ).\]](http://latex.artofproblemsolving.com/6/c/1/6c1b06ee13e000f0c15b4ccefa71f31a6f902538.png)
This means 
upon checking, we arrive at 
This post has been edited 1 time. Last edited by Keith50, May 15, 2021, 2:15 AM
February 2022
May 2021