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un=a+(n-1)b
u2=a+(2-1)b
u2=a+b
u8=55
u8=a+7b
u2=a+b=72
u8=a+7b=55
dieliminasi.
-6b=18
b=-3
u2=a+b=73
u2=a+(-3)=73
a=76
u40=a+39b
u40=76+39 (-3) = 76+(-117)=41
a+b=73
a=73-(-3)=76
Un=a+(n-1)b
U40=76+(39(-3))
U40=76-117
U40=-41
Jawaban C