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On a circumference of a given circle with a radius R two random points A & B are independently chosen.

What is the probability of AB being less than R ?

(No Solution Yet, 7 Comments) Submitted on 2018-04-26 by Ady TZIDON   
Difficulty: 3 of 5 Bonus: One is the sum of the other two (in Just Math) Rating: 2.33
Show that, given any subset A of more than 1+½n numbers from the set {1,...,n}, for some three of the given numbers, one is the sum of the other two.
(Solution Posted, 6 Comments) Submitted on 2005-07-31 by McWorter   
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