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Un= (n² - n + 4)/2
\/ \/ \/ \/ \/
1 2 3 4 5
\/ \/ \/ \/
1 1 1 1
2a = 1
a = 1/2
3a + b = 1
3 (1/2) + b = 1
3/2 + b = 1
b = 1 - 3/2
b = - 1/2
a + b + c = 2
1/2 + (-1/2) + c = 2
c = 2
rumus :
Un = an^2 + bn + c
= 1/2n^2 + (-1/2)n + 2