Question 11
Every cell of a 5×5 board contains one ladybug. At a signal, each moves diagonally to a cell sharing a corner with its starting cell, as illustrated. Some cells may receive several ladybugs and some become empty. What is the greatest possible number of empty cells?
Original source choices (retained):
A. 1
B. 3
C. 5
D. 6
E. 7
Source consistency task: solve the literal maximum problem, give a bound and construction, and explain why the printed source choice C=5 does not answer it. The original stem and choices are retained.
Original source choices (retained):
A. 1
B. 3
C. 5
D. 6
E. 7
Source consistency task: solve the literal maximum problem, give a bound and construction, and explain why the printed source choice C=5 does not answer it. The original stem and choices are retained.