4

Part of 1999 Argentina National Olympiad

Problems(1)

Coins of diameter 1 have been placed on a square of side 11

Source: Argentina 1999 OMA L3 p4

Coins of diameter

1

have been placed on a square of side

11

, without overlapping or protruding from the square. Can there be

126

127

128

combinatoricsgeometrycombinatorial geometry