query: I found this CHALLENGING problem . Help me with this?
positive_passages.docid: 157137
positive_passages.text: Expected distance between two points inside unit circle
negative_passages.docid: 125171
negative_passages.text: Help with this trigonometry problem?
negative_passages.docid: 111042
negative_passages.text: A geometry problem from high school Olympiad selection round
negative_passages.docid: 7919
negative_passages.text: The pigeonhole principle - how to solve questions like that?
negative_passages.docid: 12291
negative_passages.text: Two envelope problem revisited
negative_passages.docid: 36478
negative_passages.text: How can I solve this problem without having to do it by hand?
negative_passages.docid: 139496
negative_passages.text: Linear systems. Please help me solve this
negative_passages.docid: 26439
negative_passages.text: The problem of instant velocity
negative_passages.docid: 59419
negative_passages.text: Crafty solutions to the following limit
negative_passages.docid: 40439
negative_passages.text: about a difficult and weird Probability question
negative_passages.docid: 2251
negative_passages.text: Can someone give me a hint on how to prove this?
negative_passages.docid: 152333
negative_passages.text: A problem based on pigeonhole
negative_passages.docid: 97336
negative_passages.text: Problem: Two Trains and a Fly
negative_passages.docid: 135074
negative_passages.text: How do you solve this equation?
negative_passages.docid: 64255
negative_passages.text: Trigonometry problem
negative_passages.docid: 20287
negative_passages.text: Convergence Problem.
negative_passages.docid: 10724
negative_passages.text: Case of the 'mice problem' for $n=3$