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B. 4734. Some fields (unit cubes) constituting a cubical lattice of edge 2015 units are infected by an unknown disease. The disease will spread if at least $\displaystyle t$ fields in some row parallel to any edge of the cube are infected $\displaystyle (1 \le t \le 2015)$. In that case, every field of that row will become infected in one minute. Én is javaslok egyet: How many fields need to be infected initially in order to

$\displaystyle a)$ make it possible

$\displaystyle b)$ be certain

that the infection reaches all fields of the cube?

Proposed by G. Mészáros, Budapest

(6 points)

Deadline expired on 10 November 2015.

Statistics on problem B. 4734.
 61 students sent a solution. 4 points: 12 students. 3 points: 10 students. 2 points: 14 students. 1 point: 15 students. 0 point: 8 students. Unfair, not evaluated: 2 solutions.

• Problems in Mathematics of KöMaL, October 2015

•  Támogatóink: Morgan Stanley