Henry Ernest Dudeney/Modern Puzzles/177 - The Six-Pointed Star
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Modern Puzzles by Henry Ernest Dudeney: $177$
- The Six-Pointed Star
- We have considered the question of the five-pointed star.
- We shall now find the six-pointed star even more interesting.
- In this case we can always use the twelve consecutive numbers $1$ to $12$ and the sum of the four numbers in every line will always be $26$.
- The numbers at the six points of the star may add up to any even number from $24$ to $54$ inclusive, except $28$ and $50$, which are impossible.
- It will be seen in the example that the six points add up to $24$.
- If for every number in its present position you substitute its difference from $13$ you will get another solution, its complementary,
- with the points adding up to $54$, which is $78$ less $24$.
- The two complementary totals will always sum to $78$.
- I will give the total number of different solutions and point out some of the pretty laws which govern the problem,
- but I will leave the reader this puzzle to solve.
- There are six arrangements, and six only, in which all the lines of four and the six points also add up to $26$.
- Can you find one or all of them?
Click here for solution
Sources
- 1926: Henry Ernest Dudeney: Modern Puzzles ... (previous) ... (next): Magic Star Problems: $177$. -- The Six-Pointed Star
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Combinatorial & Topological Problems: Magic Star Puzzles: $394$. The Six-Pointed Star