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beda = -3
Un = a + (n - 1)b
-92 = -5 + (n - 1)(-3)
-92 = -5 -3n + 3
-92 = -3n - 2
92 = 3n + 2
3n + 2 = 92
3n = 92 - 2
3n = 90
n = 90/3
n = 30
Jadi, -92 adalah suku ke-30