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Kevin Long

Apparently, this user prefers to keep an air of mystery about them.

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  • Member for 5 years, 3 months
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30 Set builder notation: Colon or Vertical Line Oct 28 '15
20 Average distance from center of circle Nov 29 '18
11 Total number of integers relatively prime to $p^2$ Apr 26 '16
6 Problem from a graph theory book Mar 20 '18
5 Catalan numbers in polygons Dec 22 '20
5 How to prove $ \sum_{k=3}^n \binom nk \binom k3 =\binom n3 2^{n-3} $ Jan 12 '17
5 How can I prove $R^T\ ;R^T$ is transitive if $R$ is transitive. Oct 30 '15
4 Evaluate the sum $ 22\binom{26}{0} + 21\binom{26}{1} + 20\binom{26}{2} + \cdots + (-3)\binom{26}{25} + (-4)\binom{26}{26}. $ Oct 7 '16
4 $4$ dogs have been born in the same week. What is the probability that they were born on different days? Oct 19 '16
4 How many $4$ digit numbers can be made with exactly $3$ digits the same? Oct 3 '17
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