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1、二分图是指能将顶点划分成两个部分,每一部分内的顶点间没有边相连的简单无向图。 那么,12 个顶点的二分图至多有( )条边。 (2013年提高组)
2、无向图 G 有 7 个顶点,若不存在由奇数条边构成的简单回路,则它至多有____条边。
答: 边