Question

Se considera progresia aritmetica 3,9,15,21,..... Sa se determine termenul de rang 33 al progresiei.

Answer 1

$a_{n+1}- a_{n}=d, a_{n}= a_{1}+(n-1)d$
21-15=15-9=9-3=6 care reprezinta ratia d; d=6;
$a_{33}=3+6*32=195$

Answer 2

3,9,15,21,27,33,39,45,51,57,63,69,75,81,87,93,99,105,111,117,123,129,135,141,147,153,159,165,171,177,183,189,195.