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b = 88 - 93 = -5
Un = a + (n - 1)b
Un = 93 + (n - 1)-5
Un = 93 + 5n + 5
Un = 98 + 5n
(B) Un = 98 + 5n
U20 = 98 + 5(20)
U20 = 98 + 100
U20 = 198