Answer: 264 ways
Explanation:
The number of different ways two teams of the 12 can play each other is 12 choose 2.12*11 but remember order does not matter so divide out 2 orders....... 11*12/2 = 66 ways
Also, knowing that each team plays eachother 4 times means 4*(12 choose 2) = 4*66
4*66= 264 ways