Question

When all n teams in a league play every other team​ twice, a total of N games are​ played, where Upper N equals n squared minus n. A soccer league has 6 teams and all teams play each other twice. How many games are​ played?

Answer 1

Explanation:

n teams , teach team plying with every team twice .

no of games N = 2 x nC₂ =
`(n(n-1)* 2 )/(2)`

= n² - n

If n = 6

no of games played = 6² - 6

= 30 .