Question

In how many ways 5 persons can be arranged in a line if a particular person wants to be behind another

Answer 1

Hey
Let us say that 5 person are standing in a row.
Now take a person A who wants to stand behind someone.
First case in the one in which he stants next to the person number 1.
Second case isbwhen he stands to the next of the person 2.
Third case is when, the person wants to stand next to the 3.

Therefore the answer is 3.

Hope it helps :))