Math

Probability test

This is said to be one of the hardest GRE math questions. #math #maths #mathematics #shorts

References
https://gre.myprepclub.com/forum/of-the-20-lightbulbs-in-a-box-2-are-defective-an-inspector-1859.html
https://www.manhattanprep.com/gre/blog/hardest-gre-math-problems/

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