Twenty-eight games were played in a football tournament with each team playing once against each other. How many teams were there?

There are 15 persons in a party and if each 2 of then shakes hands with each other , how many handshakes happen in the party ?

Thalami Dharaga and Sangamithirai were playing with a bar magnet. They put the magnet down and it broke into four pieces. How many poles will be there?

(i) A kabaddi coach has 14 players ready to play. How many different teams of 7 players could the coach put on the court? (ii) There are 15 persons in a party and if , each 2 of them shakes hands wit each with each other. How many handshakes happen in the party? (iii) How many chords can be drawn through 20 points on a circle? (iv) In a parking lot one hunderd, one year old cars are parked. Out of them five are to be chosen at random for to check its pollution devices. How many different set of five cars are possible? (v) How many ways can a team of 3 boys, 2 girls and 1 transgender be selected from 5 boys, 4 girls and 2 transgender?

Forty team play a tournament. Each team plays every other team just once. Each game results in a win for one team. If each team has a 50% chance of winning each game, the probability that he end of the tournament, every team has won a different number of games is 1//780 b. 40 !//2^(780) c. 40 !//2^(780) d. none of these

The number of volleyball games that must be scheduled in a league with n teams is given by G(n)=(n^(2)-n)/(2) where each team plays with every other team exactly once. A league scheledules 15 games. How many teams are in the league?