bntu jwb kakk.......
tentukan suku yang diminta
a. 2, 6, 18, 54,. . .. , u8
u1 = a = 2
r = u2 : u1 = 6 : 2= 3
un = a rⁿ⁻¹
u8 = 2. 3⁸⁻¹
u8 -= 2. 3⁷ = 4.374
b. 54, - 18, 6 , - 2 . u8
u1 = a = 54
r =u2 : u1 = - 18 : 54
r = - 1/3
un = a rⁿ⁻¹
u8 = 54. (-1/3)⁷
u8 = 54 ( - 1/2187)
u8 = - 2/81
[answer.2.content]
