Question

Calcule o 5° termo da P.G. (9, 3, 1)

a) 1/6
b) 1/3
c) 1/9
d) 1/4
e) 1/12

Answer 1

a1 = 9
a2 = a1q = 3
q = 3/9 = 1/3 ***
n = 5
a1q⁴ =  9 * (1/3)⁴  = 9 *  1/81 = 9/81 = 1/9  **** ( c )