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misalkan: Un = an² + bn + c
0, 4, 10, 18
+4 , +6, +8
+2 +2
2a = 2
a = 1
3a + b = 4
3 + b = 4
b = 1
a + b + c = 0
1 + 1 + c = 0
c = - 2
Rumus: Un = n² + n - 2