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17 = 2 (2a + 3b)
2a + 3b = 17/2
2a = 17/2 - 3b
lalu masukan 2a ke,
S8 = 8/2 (2a + 7b)
58 = 4 (17/2-3b + 7b)
58 = 34 + 16b
24 = 16b
b = 24/16 atau 3/2
lalu masukan b untuk mencari a,
S4 = 4/2 (2a + 3b)
17 = 2 ( 2a + 3(3/2)
17 = 4a + 9
4a = 8
a = 2
lalu tinggal cari S25
S25 = 25/2 (2a + 24b)
= 25/2 ( 2(2) + 24(3/2) )
= 25/2 (4 + 36)
= 25/2 (40)
= 500