Posted by phil on .
how many can 5 people be arranged in a row if the father is on the far right?

Probability 
MathMate,
Assuming the father is one of the five people, so that leaves us with only four to choose from for 4 places.
The first place can be filled with 4 choices, the second with 3, and so on.
So the number of arrangements is
4*3*2*1=4! with the father always on the right.