Identify the game in which there is no direct contact between the body of the players and the ball except committing a foul.
two players A and B play a series of games of chess. The winning players in any games gets 1 points while the losing plays get 0 points. The player who achievers 4 point first , wins the series. If no game ends in draw, find the Number of ways in which the series is can be won by A
A bag contains a while balls and b black balls. Two players A and B alternately draw a ball from the bag, replacing the ball each time after the draw till one of the ball is white and win the game. The player A begins the game. If the probability of A winning the game is four times that of B, then the ratio a : b is