Selinaviz
Answered

[tex] \frac{30!}{28!} [/tex] =
[tex] \frac{n!}{(n-2)!} [/tex] =

Sagot :

Bituinviz
[tex]\\\frac{30!}{28!}=\frac{28!*29*30}{28!}=29*30=870 \\ \\\frac{n!}{(n-2)!}=\frac{(n-2)!*(n-1)*n}{(n-2)!}=n(n-1)=n^2-n[/tex]