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= 4 ( 50 + 7 × 3 )
= 4 × 71
= 284 kursi
baris2 = 25 + 3 = 28
baris3 = 28 + 3 =31
baris4 = 31+3 =34
baris5 = 34+3 =37
baris6 = 37+3 =40
baris7 = 40+3 = 43
baris 8 = 43+3 =46
jadi, jumlah kursi= 25+28+31+34+37+40+43+46 = 284
semoga bermanfaat, maaf kalo saya jawabnya telat