Monthly Archives: October 2014

Puzzle #79: Diwali Special

Posted on October 26, 2014 by Alok Goyal

Since playing cards is very popular during the Diwali festival, here is a special probability puzzle with cards, contributed by Alok Mittal from his Mathematical Circles class. I heard this one last night and could not resist. I am breaking … Continue reading →

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Solution to Puzzle #78: Probability of #6

Posted on October 26, 2014 by Alok Goyal

This was a tricky question…somewhat similar to the Monty Hall Problem (please see https://alokgoyal1971.com/2013/06/09/puzzle-20-the-monty-hall-problem-very-interesting-must-try/). I got a number of answers and a few of them correct in my opinion. The ones that sent the correct answers include Vishv Vivek Sharma (my … Continue reading →

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Puzzle #78: Probability of #6

Posted on October 18, 2014 by Alok Goyal

This is a wonderful probability puzzle given to me by my nephew, Karan Sharma, who lives in Jaipur and is in Class XII – thanks Karan! A man is known to speak the truth 3 out of 4 times. He … Continue reading →

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Solution to Puzzle #77: Make the Stacks Equal

Posted on October 18, 2014 by Alok Goyal

Apologies for not posting the solution last weekend, I was traveling outside the country. I received an overwhelming number of correct solutions for this puzzle. First one to come back was Alok Kucklous. Others were Aman Singla, Girish Tutakne, Ashutosh … Continue reading →

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Puzzle #77: Make the Stacks Equal

Posted on October 4, 2014 by Alok Goyal

Another beautiful puzzle from the same book as last time…”Mathematical Circle Diaries, Year 1″, by Anna Burago. This one is the last puzzle from Session 10. Six stacks of coins are places on the table. The first has 1 coin, … Continue reading →

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Solution to Puzzle #76: What’s the Final Digit?

Posted on October 4, 2014 by Alok Goyal

I received an overwhelming number of correct responses to this puzzle…though very few from the younger ones. Ones who gave the correct answers included Pooja Goyal, Naresh Kumra, Smiti Mittal, Prakhar Prakash, Girish Tutakne, Ashutosh Diwakar, Aishvarya Gupta, Ashish Gupta, … Continue reading →

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