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U20 = 5 + (20-1) 6
= 5 + (19) 6
= 119
/maaf kalo salah :D/
b = 4
Un = a + (n-1)b
U20 = 5 + (20-1)4
U20 = 5 + (19.4)
U20 = 5 + 76
U20 = 81
Semoga membantu
Maaf kalau salah