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Wei Shen’s competition problem—dare to give it a try?
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The unbelievably difficult geometry problem from the middle school entrance exam stumped a huge numb
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Here's an algebra problem: Can you solve it in seconds, or will it stump you?
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The mind-bending method of separation constants—used from middle school all the way through high sch
Even middle schoolers can tackle Peking University’s exam questions—can you?
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Insanely Difficult Geometry Auxiliary Line Problems
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