Mother has a fixed place and father, so there are 2! ways to arrange the children, hence
A family with 1 mother, 1 father, and 2 children sit in a car with 2 front seats and 3 back seats. If the mother drives with a child in the front, and the father sits in the back center seat with the other two children on either side of him, how many seating arrangements are possible?
[1]  2
[2]  4
[3]  6
[4]  8
[5]  10