In K_3,3 Let a and B Be Any Two Adjacent

Q68: fill in the blanks.<br>-The length of

Q69: Find the vertex-chromatic number, the edge-chromatic number,

Q70: Determine whether this graph is planar. <img

Q71: Consider the graph at the right. <img

Q72: fill in the blanks.<br>-The region-chromatic number

Q74: either give an example or prove that

Q75: Many supermarkets use loyalty or discount cards

Q76: Draw a cubic graph with 8 edges,

Q77: Are these two graphs isomorphic? <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6843/.jpg"

Q78: Determine whether this graph is planar. <img