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4 8
4
1) a + b + c = 2
2) 4a + 2b + c = 6
3) 9a + 3b + c = 15
4) (2) - (1) 3a + b = 4
5) (3) - (2) 5a + b = 8
(5) - (4) 2a = 4
a = 2
(5) = 5a + b = 8
5 + b = 8
b = 1
c = 0
eeehhh.. ini barisan persegi panjang kan harusnya? bukannya salah soal?