Spare parts mean more weight, more expense and less science. What if the redundancy worked differently?
2. Just two failures. To show why three aren't possible, suppose that primary function A, backup 1 and backup 3 all failed. Then function A would have no device to do it. On the other hand, two failures cause no problems.
Here is why: If two backups fail, then all functions continue. If two primaries fail, then the warm-up shows that all functions are covered. If one primary and one backup fail, then the other backup that covers that primary will take over.
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This is a Reduction-to-Practice Challenge that requires written documentation and&
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