[tex]k\in \mathbb{N}.\ k>0:k\ e\ impar\\a_1=1,\ a_1_0_1=?, \ r=2\\a_1_0_1=a_1+(n-1)r\Rightarrow a_1_0_1=1+100.2\\\Rightarrow a_1_0_1=201[/tex]
