Question

qual o terceiro termo da PG(2,4...)

Answer 1

$a_1=2 \\ a_2=4 \\ q=? \\ a_3=? \\ \\ q= \frac{a_2}{a_1} \\ q= \frac{4}{2} \\ q=2 \\ \\ a_n=a_m.q^{n-m} \\ a_3=a_2.q^{3-2} \\ a_3=4.2^{1} \\ \boxed {a_3=8}$