There are 1440 ways to split the 12 members of the Underwater Basket-Weaving club into four groups of 3 for a friendly speed basket-weaving competition, if Adi and Noor must be on different teams.
To solve this, we can use the following steps:
First, we can count the number of ways to split the 12 members into four groups of 3, without considering the restriction that Adi and Noor must be on different teams. This can be done using the following formula:
n! / (4! * (n - 12)!)
where n is the total number of members, which is 12.
Plugging this in, we get:
12! / (4! * 8!) = 495
Now, we need to subtract the number of ways to split the members into four groups of 3, with Adi and Noor on the same team. This can be done by counting the number of ways to choose two members from the 10 remaining members, and then dividing by 2, since Adi and Noor can be in either order on the same team.
10! / (2! * 8!) = 45
Finally, we need to add back the number of ways to split the members into four groups of 3, with Adi and Noor on different teams, but in the same group. This can be done by counting the number of ways to choose one member from the 10 remaining members, and then dividing by 2, since Adi and Noor can be in either order in the same group.
10! / (2! * 8!) = 20
Adding these three numbers together, we get the total number of ways to split the members into four groups of 3, with Adi and Noor on different teams:
495 - 45 + 20 = 1440