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= 4n + 5
= 4n + 5
= 4n + 5
n² - n = 2(4n + 5)
n² - n = 8n + 10
n² - 9n - 10 = 0
(n - 10) (n + 1) = 0
n₁ = 10
n₂ = -1 (tidak memenuhi karena dalam kombinasi, n ≥ 2)
Jadi, n = 10