Answer:

Explanation:
Given

Required
Probability that you seat on the far left
First, we calculate the total possible seat arrangements.
This is calculated using:




Next, the possible seat arrangements if you seat at the far left.
This implies that you can only seat 1 spot while your friends (3) can seat on any of the remaining 3 seats.
i.e.


The number of arrangement is:


The required probability is:


Simplify
