There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?
A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?