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Found: 2

Problem #PRU-100201

Problems Combinatorics Dissections, partitions, covers and tilings Tilings with ordinary and domino tiles

Tile a $5 \times 6$ rectangle in an irreducible way by laying $1 \times 2$ rectangles.

Problem #PRU-30289

Problems Algebra and arithmetic Number theory. Divisibility Odd and even numbers Combinatorics Dissections, partitions, covers and tilings Tilings with ordinary and domino tiles

Is it possible to fill a $5 \times 5$ board with $1 \times 2$ dominoes?