Question

determine o 4 termo a1= 6q= 1/2

Answer 1

a 1 = 6 
q = 1/2
a 4 = a 1 . (1/2)^n - 1
a 4 = 6 . (1/2)^4-1
a 4 = 6 . (1/2)^3
a 4 = 6 . 1/8
a 4 = 6/8
a 4 =3/4