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a1 = a
a2= ar
a3= ar²
a4=ar³
=> a2 = ar = 3/2
⇔ a = 3/2r ..........(1)
=> a4 = ar³ = 6
⇔ a = 6/r³...........(2)
De (1) y (2) :
3/2r = 6/r³ , x ≠ 0
3r³ = 12r
r² =4
r = + 2
Si: r = -2
a = 3/2(-2)
a = -3/4
⇒ tn = (-3/4) (-2) ^(n-1) =
Producto de los 3 primeros terminos = a1.a2.a3 = a³(r)³ = (-3/4)³ (-2)³ = 27/8
Si: r = + 2
a = 3/2(+2)
a = 3/4
⇒ tn = (3/4) (2) ^(n-1)
Producto de los 3 primeros terminos = a1.a2.a3 = a³(r)³ = (3/4)³ (2)³ = 27/8