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95 = 5 + (n-1)3
95 - 5 = 3(n-1)
90 = 3(n-1)
90:3 = n - 1
30 = n - 1
n = 30 + 1 = 31
Un = a + bx(n-1) = 95
95 = 5 + 3(n-1)
90 = 3n + 1
n = 30 +1 = 31