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a(n + 1) = 3(n + 1) - (n + 1)² = 3n + 3 - (n + 1)²
a(n + 1) - an = 3n + 3 - (n + 1)² - 3n + n² = 3 - n² - 2n - 1 + n² = 2 - 2n ≤ 0
Ciąg jest nierosnący ⇔ gdy n∈N⁺ a(n + 1) - an ≤ 0