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4 votes
1 answer
148 views

With the help of the cows, can you determine the secret code?

6 votes
1 answer
298 views

Solving a 90-degree rotated center on a 4x4 axis cube

11 votes
2 answers
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Make him shuffle most!

8 votes
4 answers
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Two triangles in a light bulb

17 votes
2 answers
854 views

What Is A Headered Word™?

16 votes
1 answer
331 views

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16 votes
1 answer
3k views

Is 1,111,111,111,111,111,111 prime?

24 votes
1 answer
707 views

Guess the song and artist: 19 × 46 = 784

13 votes
1 answer
414 views

A Creative Approach

5 votes
2 answers
345 views

Show that the area of the region inside this square and regular pentagon is greater than 3/4

6 votes
1 answer
203 views

Progressive matrix of squares and circles

7 votes
1 answer
327 views

Cracking a coded quintic equation

18 votes
3 answers
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How many computers can be connected at once?

12 votes
0 answers
350 views
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