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David
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Family of subsets such that there are at most two sets containing two given elements
Mar 25, 2012
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8
Number of x such that $m-x^2$ and $n-x^2$ are both squares
Apr 25, 2012
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6
Conditions for an analogue of Cauchy-Davenport for simple groups
Feb 18, 2012
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Examples of using additive structure to analyze size of a set mod some ideal?
Mar 8, 2012
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Pairs of numbers in columns of an increasing matrix
Apr 2, 2012
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Solutions (a,b,c,d) to $a^2+b^2 = x$, $b^2+c^2 = y$, $c^2+d^2 = z$
May 7, 2012
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Why can algebraic geometry be applied into theoretical physics?
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A man is known to speak truth 3 out of 4 times. He throws a die and reports that it is a six. Find the probability that it is actually a six.
6
use combinatorial reasoning to calculate $ \sum{\binom{100}{a}\binom{200}{b}\binom{300}{c}}$