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Verified answer
A = bil. pertama = 3b = beda (selisih) = 7 - 3 = 4
Un = a + (n - 1) b
U20 = 3 + (20 - 1) 4
= 3 + 19 × 4
= 3 + 76
= 79
☛️ Jadi, jawabannya D.