Apakah bilangan ganjil?
Paritas (matematika)
Genap 



=
{
2
k
:
k
∈

Z

}


{\displaystyle =\{2k:k\in \mathbb {Z} \}}


Ganjil 



=
{
2
k
+
1
:
k
∈

Z

}


{\displaystyle =\{2k+1:k\in \mathbb {Z} \}}

