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ruud de rooij

@ruuddotorg.bsky.social

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ruud de rooij @ruuddotorg.bsky.social · 6mo ago

The 19 ways to split a 2x2x2 cube into 2 equal tetracubes.

A drawing made with a pen plotter showing geometric figures of 19 cubes divided into two parts.

ruud de rooij @ruuddotorg.bsky.social · 2y ago

There are 2025 distinct ways to choose the letters of the word WONDERFUL from the grid, so that each letter is in a unique row and column. Have a WONDERFUL 2025!

A card showing "Have a WONDERFUL 2025".

The card shows a 9x9 grid of the letters of the word WONDERFUL scrambled in each row and column, and one instance of the word highlighted with squares around the letters.

A card showing "Have a WONDERFUL 2025".

The card shows a 9x9 grid of the letters of the word WONDERFUL scrambled in each row and column, and one instance of the word highlighted with squares around the letters.