tolong bantu 🙏🏻 U2 = 3 dan U5 = 1/9 tentukan rasio barisan tersebut dan jumlah 6 suku pertama

U5 = ar⁴ = 1/9 U2 = ar = 3 ar⁴ = 1/9 ----------- ar = 3 r³ = (1/9) x (1/3) r³ = 1/27 r = ³√1/27 r = 1/3 U2 = ar = 3 a x (1/3) = 3 a = 3 : (1/3) a = 3 x 3 a = 9 Rasio = 1/3 a(1 - r^n) Sn = ------------. Rumus untuk r < 1 1 - r 9 ( 1 - (1/3)⁶) S6 = ----------------- 1 - (1/3) 9 (1 - (1/729)) S6 = ------------------ 2/3 9 x (728/729) S6 = ------------------ 2/3 (728/81) S6 = --------------- 2/3 S6 = (728/81) x (3/2) S6 = 364/27