Žaba skače po vrhovima trokuta
. Na koliko načina može napraviti
skoka tako da započne u vrhu
, a završi u vrhu
?
The frog jumps on the vertices of the triangle
. In how many ways can he make
jumps so that he starts at vertex
and ends at vertex
?
[lang = hr]
Žaba skače po vrhovima trokuta $ABC$. Na koliko načina može napraviti $4$ skoka tako da započne u vrhu $A$, a završi u vrhu $B$?
[/lang]
[lang = en]
The frog jumps on the vertices of the triangle $ABC$. In how many ways can he make $4$ jumps so that he starts at vertex $A$ and ends at vertex $B$?
[/lang]
