Which of the following is not part of the maintenance formula?

The maintenance formula typically involves the fundamental practices that ensure that equipment, tools, or facilities remain in optimal condition and are safe to use. This includes actions such as cleaning, inspecting, and caring for the equipment.

Cleaning helps remove dirt and contaminants that can cause wear or malfunction, while inspecting involves regularly checking the equipment to identify any signs of damage or issues that may require attention. Care encompasses a variety of maintenance tasks that ensure the equipment functions properly and is well maintained over time.

The option related to purchasing does not fit within the context of maintenance tasks. While purchasing is essential for acquiring new equipment or replacing old tools, it does not directly relate to the ongoing maintenance and upkeep of items already in use. Thus, it is understood that purchasing is not part of the maintenance formula, which focuses on actions taken after equipment has been acquired.