Un = a + ( n - 1 ) b
99 = 3 + ( n - 1 ) 3
99 = 3 + 3n - 3
99 = 3 - 3 + 3n
99 = 0 + 3n
99 = 3n
n = 99/3
n = 33
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Un = a + ( n - 1 ) b
99 = 3 + ( n - 1 ) 3
99 = 3 + 3n - 3
99 = 3 - 3 + 3n
99 = 0 + 3n
99 = 3n
n = 99/3
n = 33