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+2 +3 +4 +5
+1 +1 +1
2a = 1
a = 1/2
3a + b = 2
3/2 + b = 2
b = 1/2
a + b + c = 1
1/2 + 1/2 + c = 1
c = 0
Rumus:
Un = (1/2)n² + (1/2)n