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suku awal = a = 2
beda = b = 3,5 - 2 = 1,5
ditanyakan
U13
jawab
Un = a +(n-1)b
U13 = 2 + (13-1)1,5
U13 = 2 + (12 x 1,5)
U13 = 2 + 18
U13 = 20