Online Course Discussion Forum

Need help on II-A Number Theory 2.27

 
 
Picture of Kevin Song
Need help on II-A Number Theory 2.27
by Kevin Song - Sunday, 7 March 2021, 9:19 AM
 

Hello, I don't know how to do it.

Thanks

 
Picture of Areteem Professor
Re: Need help on II-A Number Theory 2.27
by Areteem Professor - Friday, 12 March 2021, 11:52 AM
 

Since $n$ is odd, it must be that $a$ is odd and $b$ is even (or vice versa). Say then $a = 2k + 1$, and $b = 2l$ for some integers $k$ and $l$. What can you say about $n$ now?