Tag Archives: logic puzzles

Solution to Puzzle #113: Magic Arrangement of Cards

Posted on September 21, 2015 by Alok Goyal

I got an overwhelming response to this puzzle – so many that putting down the names of correct answers is not feasible. This was also the best viewership of the blog for any week since I started this blog – … Continue reading →

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Solution to Puzzle #112: Weights and Balance Revisited

Posted on September 12, 2015 by Alok Goyal

As I mentioned in the question, this is an age old problem, but I was still intrigued by the twist provided to this puzzle by a colleague’s daughter. Many people gave a correct answer to the first two parts of … Continue reading →

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Solution to Puzzle #111: Soldiers In a Line

Posted on September 6, 2015 by Alok Goyal

This was a difficult puzzle. I had trouble understanding the answer even when it was given to me, and had to go to Alok Mittal for rescue. Siddharth Goel (Founder, Adstrak) gave some useful links for this puzzle and Sumar … Continue reading →

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Solution to Puzzle #110: Circular Dining Table

Posted on August 29, 2015 by Alok Goyal

This was a relatively easy puzzle and many people sent a correct answer. That included Siddhartha Goel, Suman Saraf, Pratik Poddar, Traveling Salesman (which I believe is a nick name), Narsimha Pai and Salil Panikkaveettil. The puzzle used a popular … Continue reading →

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Puzzle #111: Soldiers in a Line

Posted on August 23, 2015 by Alok Goyal

This is another beautiful puzzle that I got through my daughter (Anisha) and her friend (Abhiram), which they got in Alok Mittal’s Mathematical Circles class. In a line up of 10 soldiers, what is the least number of soldiers that … Continue reading →

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Solution to Puzzle #109: Fox in a Hole

Posted on August 23, 2015 by Alok Goyal

From this week, I am moving to a one-week shifted model, where I will publish the solution for puzzles posted 2 week back instead of one week back, this will give everyone two weeks to look at the puzzle just … Continue reading →

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Puzzle #110: Circular Dining Table

Posted on August 15, 2015 by Alok Goyal

I am leaving for a vacation, and hence not able to post the solution to the last week’s puzzle. In the meantime, here is another puzzle, will post the answers to both next week. This puzzle is courtesy Alok Mittal, … Continue reading →

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Puzzle #109: Fox in a Hole

Posted on August 8, 2015 by Alok Goyal

A beautiful logic puzzle that I found on Gurmeet’s puzzle collection, which he has attributed originally to K Rustan M Leino at Microsoft Research. Consider five holes in a line. One of them is occupied by a fox. Each night, … Continue reading →

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Solution To Puzzle #107: The Longest Path

Posted on July 26, 2015 by Alok Goyal

I was surprised to see relatively fewer answers for this puzzle. I received two partially correct answer and one fully correct answer. Anisha, my 11 year old, correctly pointed out the maximum length, and so did Mayank Aggarwal from California. … Continue reading →

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Puzzle #107: The Longest Path

Posted on July 19, 2015 by Alok Goyal

I read this beautiful puzzle in the book “Invitation to a Mathematical Festival” by Ivan Yashchenko. Take a look at the figure below. A tourist wants to walk along the streets of Old Town from the train station (A) to … Continue reading →

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