Question

Dada a P.G. (1,3,9,27...) determine a) A razão
b) o primeiro termo
c)11° termo
d)16° termo
e) 20° termo

Answer 1

 (1,3,9,27...) 

a) q=9/3=3

b)1

c)a₁₁=a₁.qⁿ⁻¹
   a₁₁=1.3¹⁰
   a₁₁=59.049

d) a₁₆=1.3¹⁵= 14.348.907

e)a₂₀=1.3¹⁹=1.162.261.467

Answer 2

a)3
b)1
c,d,e) An= A1.q^(n-1)