Seven Passengers Are on a Waiting List for an Overbooked

question 102

Essay

Seven passengers are on a waiting list for an overbooked flight.As a result of cancellations, 3
seats become available.How many different ways can those 3 available seats be filled regardless
of the order?

---

Definitions:

ABS Hydraulic Brake Systems

Anti-lock Braking System (ABS) that prevents the wheels from locking up and skidding during braking by automatically modulating brake pressure.

Output Air Pressure

The pressure of air delivered from a compressor or a pressurized system, useful in various mechanical and pneumatic applications.

Drum Servo Brakes

A type of brake system that uses a servo mechanism to amplify the force applied by the driver, improving braking efficiency especially in heavy vehicles.

Self-energizing

Referring to a mechanism that uses the motion or force of its operation to increase its effectiveness without needing an external power source.