# Tag Archives: combinatorial puzzles

## Solution to Puzzle #197: 10 Friends

This was a relatively simple puzzle, and I got correct answers from Suman Saraf, Mohit Khare, Vishal Poddar and Pratik Poddar – thank you all! The answer is 1024. An easy way to think about this is to create a … Continue reading

## Puzzle #197: 10 Friends

This is a very common puzzle, many variants of which one would have. I still like it as the answer is very elegant, and teaches children a methodology. This one is from Mathematical Circles (Russian Experience) by Dmitri Fomin, Sergey … Continue reading

Posted in Puzzles | | 3 Comments

## Solution to Puzzle #177: How Many Times Can You Measure

This was a difficult puzzle. I got the correct answer only from Suman Saraf, and another correct answer to a slightly modified puzzle from Pratik Poddar. You can measure 23 different lengths. Here’s an explanation, taken from the site fivethrityeight.com. The … Continue reading

## Puzzle #177: How Many Times You Can Measure

This is a variation of Puzzle #14 (https://alokgoyal1971.com/2013/04/28/puzzle-14-measuring-time/) that I found on the site fivethirtyeight.com. A fantastic puzzle! Suppose you have four ropes and a lighter. Each rope burns at a non-constant rate but takes exactly one hour to burn … Continue reading

Posted in Puzzles | | 3 Comments

## Solution to Puzzle #168: Who Gets the Easter Eggs?

This was a very counterintuitive puzzle, and a relatively difficult one, though one does not need to know any specific mathematical construct for it. Only two people (father – daughter pair) got the correct answer – Mahi and Suman Saraf! … Continue reading

## Solution to Puzzle #105: The 150 Year Old Puzzle

This was indeed a more difficult puzzle than it appeared and for a change I did not get any correct solution. One realises that after trying a few combinations for the first 2-3 days, one invariably gets stuck in a … Continue reading

## Puzzle #105: 150 Year Old Puzzle

This is truly an old puzzle. I was sent this one by Salik Shah (thank you Salik). It appeared in the WIRED magazine. I am reproducing the puzzle verbatim as I saw it in WIRED: IN 1850, THE Reverend Thomas … Continue reading

## Solution to Puzzle #95: How Many Ways to Play the Tabla

Thanks for a record breaking viewership this week…this is the maximum traffic I have had on the site ever since I started the puzzle! Many people sent the correct answer (which is 34 ways to do it). Some people gave … Continue reading