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Author Archives: Alok Goyal
Solution to Puzzle #20: The Monty Hall Problem
This is a very tantalizing puzzle. At the outset it is very difficult to see why the odds should be different than 50-50. Thanks to everyone who responded, and there were many who did. The answer goes as follows: Contestants … Continue reading
Puzzle #20: The Monty Hall Problem (Very Interesting – Must try!)
This is a puzzle I picked up from the Movie “21” that I was watching 2 days back. The scene is a class in MIT, where the professor gives this problem to one of the students. Here it goes: Suppose … Continue reading
Solution to Puzzle #19: Find the Average Salary
This puzzle generated more responses than any of the other puzzles I have sent to date – thanks for the overwhelming response. What was more heartening was the creativity of the different solutions I received. In the solution, therefore, I … Continue reading
Puzzle #19: Find the Average Salary
This is one of the best puzzles I have posted, and would highly encourage all of you to try it – kids as well as adults. Four honest and hard-working computer engineers are sipping coffee at Starbucks. They wish to … Continue reading
Solution to Puzzle #18: Who Will Win The Game
I got two correct answers for the puzzle – no surprise that Tishyaa was one of them, and I also got an answer from Alok Kuchlous immediately after I posted the puzzle – thanks! The answer was relatively simple – … Continue reading
Puzzle #18: Who will win the game?
Here is a two player game – there are three piles of stones: one with 10 stones, one with 15 stones, and one with 20 stones. At each turn, a player can choose one of the piles and divide it … Continue reading
Solution to Puzzle #17: Perfect Square with 0’s, 1’s and 2’s
Surprisingly I did not get any correct answers to the puzzle. The solution to the puzzle lies in divisibility rules – any number with 100 0’s, 1’s and 2’s will be divisible by 3 since the digits add up to … Continue reading
Puzzle #17: Perfect Square with 0’s, 1’s and 2’s
Since the previous puzzle was very tough, a relatively simpler problem. Can a number be written with one hundred 0’s, one hundred 1’s and one hundred 2’s be a perfect square. If yes, what is that number, if not, prove … Continue reading
Solution to Puzzle #16: Crossing the Desert
This is probably one of the tougher puzzles, and the responses indicate the same. I got only one answer for the puzzle, and once again, from Tishyaa – Thank you Tishyaa! 1. For the simpler puzzle, One needs to to … Continue reading
Puzzle #16: Crossing the Desert, a Classic Puzzle!
This is one of my favorites – I read this puzzle for the first time in 1992 on rec.puzzles (for those of you who remember these newsgroups!), and honestly have struggled with this ever since. I saw this puzzle again … Continue reading
Alok Goyal's Puzzles Page 