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S5 = 1/2n (2A + (n-1)B = 5/2 ( 2A + 4B) = 80 A = 42- 6.6,5
A + 6B = 42 dikali 5 A = 42 -39
5A + 10B = 80 - dikai 1 A = 3
5A + 30B = 210
5A + 10B = 80 -
20 B = 130
B = 6,5
Sehingga U20 = 3 + 19. 6.5 = 3 +123,5 = 126,5
S20 = 20/2 (2.3 + 19. 6,5) = 1295