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7 x 14 = 98 suku ke-14=98
jumlah suku = n/2 (a+un) = 14/2 (7+98) = 735
2) jumlahnya adalah n/2 (a+un) = 15/2 (5+75) = 7,5(80) = 600
kurangi dng kelipatan 6 yitu 30 dan 60 = 600 - 30 -60 = 510