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b = 6
Un = a + ( n-1) b
Un = 7+ (n-1)6
Un = 7+6n-6
Un =6n+1
3.) a= 12
b= -5
Un = a + ( n-1) b
Un = 12+ (n-1)-5
Un= 12 - 5n + 5
Un= 17-5n