Guerrero Harper
02/11/2023 · Primary School

27. Diketahui jumlah suku-suku suatu barisan aritmetika adalah 585 . Jika suku pertama ditambah 3 , suku kedua ditambah 9 , suku ketiga ditambah 15 , dan seterusnya, maka diperoleh jumlah suku-suku barisan yang baru senilai 1.092 . Jumlah suku pertama, suku tengah, dan suku terakhir barisan tersebut adalah \( \ldots \). \( \begin{array}{lll}\text { A. } 45 & \text { C. } 135 & \text { E. } 225 \\ \text { B. } 90 & \text { D. } 180 & \end{array} \)

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The first term, the middle term, and the last term of the arithmetic sequence are 90.

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