Question

determine o 7° termo da pg (1,4...)

Answer 1

q = a2/a1 = 4/1 = 4
an = a1xq^n-1

a7 = 1 x 4^6
a7 = 1 x 4096
a7 = 4096

Answer 2

$PG~\{1,4,...\}\\\\\\ a_1=1\\ q=4:1=4\\ n=7\\ a_7=?\\\\\\ a_n=a_1\times q^{n-1}\\\\\\ a_7=1\times 4^{7-1}\to\\\\ a_7=1\times 4^{6}\to\\\\ a_7=1 \times 4096\to\\\\ \boxed{a_7=4096}\\\\\\\\ PG~\{1,4, 16, 64, 256, 1024, 4096\}$