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•4 Să se calculeze: 18! (n - 1)! a) b) 16! (n + 1)!' c) P₂+ P₁ + Psi 51-81 41-337' 213! e) -f) 210!' 3!+4!+5! 2!+3!+4!' 4 g) .1 + 2! 2 3! 3 10-9 41 31 +4-b) 11! - 10 n! (n-3)! n ≥ 3; • j) 1 (n-3)!' (n - 5)!' n≥ 5; •k) 1 (n+1)! (n+2)!​