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756 = 6 + 3n - 3
756 = 3 + 3n
756 - 3= 3n
753/3 = n
n = 251
Un = 6+(n-1)3
756 = 6+3n-3
756 = 3+3n
756-3 = 3n
753 = 3n
753/3 n
251 = n