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5b = 25
b= 5
Un= a+(n-1)b
U3= a +(3-1)5 = -17
U3= a +(2)5 = -17
U3= a+10= -17
a= -17-10
a= -27
U26= -27+(26-1)5
U26= -27+(25)5
U26= -27 + 125
U26= 98