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Cara ada digambar maaf jika kurang memuaskan
U8 = a + 7b = 30
________________-
-2b = 0
b = 0/-2
b = 0
U4 = a + 3b = 9
U4 = a + 3(0) = 9
a = 9 - 0
a = 9
Sn = n/2 (2a + (n-1)b
S20 = 20/2 (2(9)+(20-1)0
S20 = 10(18+19)0
S20 = 0