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u8= a+ 7b= 8 -
-4b = -20
b = -20/-4 = 5
a+3b = -12
a +15 = -12
a= -12-15= -27
un = a+(n-1)b
u100 = -27 + (100-1)5
= -27+ 99(5)
= -27+495
= 468 ...C