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Quandaries & Queries
Q & Q
 Topic: directed graph
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 The adjacency matrix of an undirected graph 2010-01-15 From Bhavya:Let Cn be the undirected graph with vertex set V = {1,2,3,...,n} and edge set E = {(1,2), (2,3), (3,4),.... , (n-1,n), (n,1)}. Let An be the adjacency matrix of Cn. a. Find the determinant of An. b. Find (An)^2Answered by Robert Dawson. The two-digit numbers from 10-99 1998-01-21 From Alexis Riddle:My name is Alexis. I'm a student in 8th grade and I'm taking Algebra I Honors. My question is: In a string of numbers, two adjacent digits are considered as a two-digit number. For instance, the string 11012 contains the numbers 10, 11, and 12. What is the number of digits in the smallest string that contains all of the two-digit numbers from 10-99? Please help and thank you for any assistance you can give me.Answered by Penny Nom.

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