Monthly Archives: July 2016

Puzzle #148: The First Black Ace

Yet another wonderful puzzle from Martin Gardner’s book “The Colossal Book of Short Problems and Puzzles”. This one is a probability puzzle, and something you should try with your children. A deck of 52 playing cards is shuffled and placed facedown … Continue reading

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Solution to Puzzle #146: The Proud Party Goers

Apologies for not being able to post last weekend, ended up in parenting duties more than I bargained for! This was not a very difficult puzzle, but I did not get as many solutions. Congratulations to Suman Saraf, Gautam Kumar … Continue reading

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Puzzle #147: The “Aha” IBM Puzzle!

Sometimes I worry whether I will continue to get good puzzles for children, but every such time one comes across some beautiful puzzle! I came across one such yesterday in Martin Gardner’s book “The Colossal Book of Short Problems and … Continue reading

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Solution to Puzzle #145: The WHO Puzzle

This was perhaps not an easy problem for children, but I got correct responses from Suman Saraf, Abhinav Jain and Pratik Poddar. The correct answer is ~0.01%, that is the probability of you having the disease is very low, even … Continue reading

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Puzzle #146: The Proud Party Goers

This is a very nice puzzle I got from a site (fivethirtyeight.com) recommended to me by Suman Saraf – thanks Suman. It’s Friday and that means it’s party time! A group of N people are in attendance at your shindig, … Continue reading

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Solution to Puzzle #144: Pirates and Gold Once Again

Many correct responses to this puzzle, but the I was happiest to see was Danny from Washington DC, an 8th grader – well done Danny. Other people who sent the right answer included Suman Saraf, Vivek Rai and Pratik Poddar. … Continue reading

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Puzzle #145: The WHO Puzzle

This is another puzzle from the Ramanujan collection, a nice probability puzzle! The World Health Organization has just identified a new disease. The good news is that it is very rare: only 1 in every million people has it. The … Continue reading

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