Question

va rog cu formula!!!....nu mai Mio amintesc​

Answer 1

Răspuns:

C₁₁⁹-C₁₁²=C₁₁¹¹⁻⁹-C₁₁²=

C₁₁²-C₁₁²=0S-a folosit formula

Cₙˣ=Cₙⁿ⁻ˣ

Metoda 2

Cₙˣ=n!/x!*(n-x)!

C₁₁⁹-C₁₁²=

11!/9!(11-9)!-11!/2!(11-2)!=

11!/9!*2!-11!/2!*9!=0

Explicație pas cu pas:

Answer 2

Răspuns:

Explicație pas cu pas:

C11 luate cate 9=C11 luate cate (11-9)=C11 luate cate 2

Cn luate luate cate k=n!/k!(n-k)!

Cn luate cate k=Cn luate cate (n-k)

C11 luate cate 2-C11 luate cate 2=0