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= 5. 1 - 10+ 5
= 5-10+5
= 0
U2 = 5. 2^2 - 10. 2 + 5
= 5. 4 - 20 + 5
= 20-20+5
= 5
U3 = 5. 3^3 - 10 . 3 +5
= 5. 9 -30 +5
= 45- 30+5
= 20
pola barisannya : 0, 5, 20, 45, 80 dan seterusnya
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