In engineering reliability analysis, why does an engineer need to distinguish between combinations and sequences (permutations) when calculating the probability of a system success?

Question

In engineering reliability analysis, why does an engineer need to distinguish between  combinations  and  sequences  (permutations) when calculating the probability of a system success?

Answer

Combinations always result in a larger sample space than sequences for the same set of items.

Answer

Sequences are used when the total number of components is greater than the number of available slots.

Answer

Combinations are used only when the specific order of component failure does not change the final state of the system.

Answer

Sequences are only necessary when all components in a system are identical and interchangeable.

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