contestada

In a huge chess tournament, 45 matches were played. Find out how many people were involved if it is known that each participant played one game with every other participant in the tournament.

Respuesta :

there was 45 combinations of 2  so

xC2 = 45   where x = number of players 

10C2  = (10*9) / 2  = 45 

So there were 10 players involved