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B. 4725. Show that if a simple graph has 7 vertices and no cycle of length 4 then it has a vertex whose degree is at most 2.

(4 points)

Deadline expired on 12 October 2015.

Statistics on problem B. 4725.
 159 students sent a solution. 4 points: 119 students. 3 points: 15 students. 2 points: 8 students. 1 point: 12 students. 0 point: 3 students. Unfair, not evaluated: 1 solution. Unfair, not evaluated: 1 solution.

• Problems in Mathematics of KöMaL, September 2015

•  Támogatóink: Morgan Stanley