Could you give me a proper idea as to why this logic works and is used extensively? Any articles (small ones) would also be appreciated.
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Let’s say you have a system that will fail 50% of the time you use it. You want more reliability.
Having 2 of the systems, and using the 2nd if the first one fails, changes things. While each system still fails 50% of the time, the odds of BOTH systems failing is 25%. Add a 3rd and it’s 12.5%. Each redundant system you add makes it less and less likely that EVERY system will fail, which means even if you have to try 10 times you’ll get your answer.
Now, usually it’s a better idea to fix what causes the failure. But for some things, we know it’s not possible to have a 0% failure rate. So if we don’t like the failure rate and have no easy way to prevent failure, having a redundant system gives us more chances to roll the dice.
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