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3. Rumus suku ke-n dari barisan -12, -93, -7, 45, -2 -- adalah ...
a. Un = 1/2(29 – 5n) d. U.= 1/2(9-25n)
b. U. = 1/2(sn – 29) e. Un=1/2(9n – 25)
c.Un = 1/2(25n-9)
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11. Diketahui barisan 2, 8, 14, 20, 26, . ... Rumus jumlah n suku pertama barisan tersebut adalah n n a. S = n2-n d. S = 3n2 - 2n b. S = n2 - 3n e. S = 3n? - n c. Sn = 3n2 – 3n 12. Hasil dari 4 + 7 + 10 + 13 + ... + 31 = .... a. 195 d. 182 b. 193 e. 175 187 c.
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