Question

encontre o nono termo da pg [3,6,12,...]

Answer 1

$PG~\{3,6,12,...\}\\\\\\ a_1=3\\ q=6:3=2\\ n=9\\a_n=?\\\\\\ a_n=a_1\times q ^{n-1}\\\\ \\a_9=3\times 2^{9-1} \to \\ a_9=3\times 2^8 \to \\a_9=3\times 256 \to \\ \boxed{a_9=768}$