Final answer:
The formula for the number and spacing between wire rope clips depends on the rope's diameter and the clip manufacturer's recommendations. Adjustments to rope length, like doubling it, could necessitate a change in the number and spacing of clips.
Step-by-step explanation:
The formula for the number and spacing between wire rope clips is not provided in the context of the student question, however, in general practice, the number of wire rope clips required and the spacing between them depend on the diameter of the rope and the specific recommendations of the clip manufacturer.
Proper installation of wire rope clips usually includes evenly spaced clips with a minimum number of clips according to the rope's diameter and a turn back of rope length also relative to the rope diameter. If the length of the rope were doubled, such as in the hypothetical scenario (c), the total number of clips needed might change if it affects the load or configuration.
When adjusting the length of the rope, repeated steps such as measuring the distance between successive dots (presumably markers for clip placement) should also be considered and noted as they are crucial for safety and load integrity. Specific regulations or best practices may also affect this process and should always be consulted.