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U7 = a + 6b = 25
......-----Kurangi-----
Didapat, 3b = 12 sehingga b = 4
Dan,
a + 6b = 25
a + 6.4 = 25
a + 24 = 25
a = 25-24, didapat a = 1
Sehingga,
jadi a+ 6b = 25
a +9b = 37
El 1 dan 2 ditemukan
b = 4 dan a = 1 shg
S20 = 10 (2 + 19.4)
S20 = 10 (2 + 76)
S20 = 10 . 78
= 780