## Special Puzzle 004 – Abstract Exact Cover

Inspired from this Wikipedia article.

Choose some sets such that the intersection between any two of the sets is an empty set and the union of them is {1, 2, …, 10}. In other (less mathematical) words, choose some groups so each number from 1 to 10 appears exactly once among the chosen groups.

A = {2, 6, 7, 9}
B = {1, 2, 4, 6}
C = {1, 3, 5, 8}
D = {3, 5, 6, 10}
E = {2, 7, 9, 10}
F = {4, 8, 9}
G = {4, 10}

The author of http://chaosatthesky.wordpress.com/ aka Chaos at the Sky, containing puzzles and more.
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### 6 Responses to Special Puzzle 004 – Abstract Exact Cover

1. 88673 says:

[solution snipped by admin] Yes, that’s correct.

2. José says:

3. José says:

I mean, [solution snipped by admin]. sorry

Yes, that’s correct.

4. ksun48 says:

[solution snipped by admin] Yes, that’s correct.

5. Took me like 5 seconds… I am sorry to say, I think this is your worst puzzle Ivan 😦 Well, I really like most of your puzzles so keep it up!

• chaotic_iak says:

…that’s why it’s called a Special Puzzle.