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a + 6b = 38
a + 2b = 18 (dikurangi)
4b = 20
b = 5
a + 2b = 18
a + 2(5) = 18
a = 18-10 = 8
Jumlah 24 suku pertama.
S24 = 24/2 (2.8 + 23.5)
= 12 (16 + 115)
= 12 (131) = 1572.
jadi, jumlah 24 suku pertama yaitu 1572.