Question

1- Qual é o 22°termo da P.G. ( 80;40; 20....).

Answer 1

Resposta:

q=a₂/a₁ =40/80=1/2

aₙ=a₁ *qⁿ⁻¹

a₂₂ = 80 * (1/2)²²⁻¹

a₂₂ =80/2²¹ = 5*2⁴/2²¹ = 5/2²¹⁻⁴ =5/2¹⁷