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U9 = a + 8b = 1533
lalu menggunakan cara eliminasi sehingga b = 1536
U10 = a + 9 × 1536 = 3069
a = 3069 - 13824
a = - 10755
Sn = 5/2 (2 × -10755 + 4×1536)
= 5/2 (-21510 + 6144)
= 5/2 × -15366
Sn = 38415