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138 itu jawabnnya.. tinggal tambah 6 aja kalau mau tau jwbnnyq, ane slupa rumusnyaU20 = 0 + (20 - 1) 6
= 0 + 19 × 6
= 114
Sn = ½ n (a + Un)
S20 = ½ × 20 (0 + 114)
= 10 × 114
= 1140
☛️ Jadi, jumlah 20 suku pertama dari deret aritmatika tersebut adalah 1140.