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U19 = u1 + (n-1)b
U19 = 8 + (19 - 1) . 4
U19 = 8 + (18).4
u19 = 8 + 72 = 80
b. Suku ke19
U19 = a+18b
= 8+18(4)
= 8+72
= 80
Maaf, kalau salah.