Question

When all n teams in a league play every other team​ twice, a total of N games are​ played, where N=n2−n. A soccer league has 5 teams and all teams play each other twice. How many games are​ played?

Answer 1

Step-by-step explanation:

using N=n^2-n

let n be 5 which is no of teams

N=5^2-5

N=25-5

N=20

where N is for only one match

so,let 2 matches be x

x=2N

x=2×20

x=40

so they played a total of 40 matches