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misal:
Un = an² + bn + c
3, 6, 11, 18
+3 +5 +7
+2 +2
2a = 2
a = 1
3a + b = 3
3 + b = 3
b = 0
a + b + c = 3
1 + 0 + c = 3
c = 2
jadi:
Un = n² + 2