when I posted Monday's brain teaser on Sunday,
so here is another to start the week,
During World War II, the mathematician Abraham Wald was
asked to help with determining which parts of the allied forces' planes must be
armored better. After examining the surviving American planes, he noticed that
there were many holes in the fuselage, and very few in the engines. After
careful thinking, he suggested that the armor on the engines must be improved.
Why?
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Abraham Wald realized that the holes should have been
distributed more evenly across the planes. Therefore the planes which had more
holes in the fuselage survived, while the planes which had more holes in the
engines got destroyed.
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