Question

Cum se cheama si cum se rezolva?? Va rog mult!

Answer 1

Se numesc combinari.

Combinari de n luate cate k = n!/ k!(n-k)!

Combinari de 4 luate cate 1= 4!/ 1!(4-1)! = 1×2×3×4/ 1×2×3= 4

Combinari de 4 luate cate 3= 4!/3!(4-3)!= 1×2×3×4/1×2×3 =4

Combinari de 3 luate cate 0=0