im not sure about the first one but im 100% about 2 and 3
2-A
3-D
Answer:
1440 different arrangements are possible.
Step-by-step explanation:
Number of arrangements of n elements:
The number of arrangements of n elements is given by:

In this question:
6 couples, in which each can be positioned in 2 ways(him/her or her/him). So

1440 different arrangements are possible.
9 - 1 + x + 2 ( x )
9x - x + x2 + 2x
x2 + 10x