Question

O quarto termo da P.G (1,4...)??

Answer 1

veja...

$a_n=a_4=? \\ a_1=1 \\ r=q=4\div1=4 \\ n=4 \\ \\ a_n=a_1.q^{n-1} \\ \\ a_4=1.4^{4-1} \\ \\ a_4=1.4^3 \\ \\ a_4=64$