Question

determine o 5° termo da pg (1/81, 1/27, 1/9,...)

Answer 1

a1 =  1/81
a2 = 1/27
a3 = 1/9
q = 1/27 : 1/81 =  1/27 * 81/1 = 81/27 = 3 ******
a5 =  a1q^4 =  1/81 * 3^4   =  1/81 * 81/1 = 81/81 = 1 ****