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High School
By
Shiva Kintali
on Sept. 27, 2013 | Updated Jan. 4, 2018
Color of the last ball
In a large urn there are \(w\) white balls and \(b\) black balls. Beside the urn is a big pile (infinite number) of black balls. Now, we do the following. First, two balls are drawn at random from the…
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invariant
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High School
By
Shiva Kintali
on Sept. 27, 2013 | Updated Jan. 4, 2018
Token game and Invariant
Consider the following game. Initially, there are two tokens in a row; the left one is blue and the right one is red. You can change the configuration by performing a number of moves. In ea…
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