Question

me ajudem por favor​

Answer 1

C₂.₅ = 5! / (5-2)! · 2!

C₂.₅ = 5! / 3! · 2

C₂.₅ = 120 / 6 · 2

C₂.₅ = 120 / 12

C₂.₅ = 10