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c→ 0 3 9 18 30
a+b→ +3 +6 +9 +12
2a→ +3 +3 +3
Un = a.n² + b.n + c
U₁₀ = 1,5 × 10² + 15 × 10 + 0
U₁₀ = 150 + 15 + 0 = 165
(A. 165)