A simple graph can be used to determine the minimum number of queens on a chessboard that control the entire chessboard. An
*32.How many nonisomorphic simple connected graphs with five vertices are there
a) with no vertex of degree more than two?
b) with chromatic number equal to four?
c) that are nonplanar?
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Discrete Mathematics and Its Applications ( 8th International Edition ) ISBN:9781260091991
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