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Brain teaser

10 Digit number puzzle of John Conway with solution

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Find the 10 unique digit number having the special property that the number formed by digits from left to right up to the place for each of the 10 places is divisible by the place number—is a beautiful puzzle presented by John Conway. It is a large and complex puzzle but can be solved using only the basic concepts taught in middle schools…

King queen and washerman river crossing puzzle

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Three couples—king and queen, and minister and washerman with their wives have to cross a river in a boat that can carry at most 2 passengers at a time. The husbands are jealous and without her husband, no lady can be left on any side of the river with other male(s). To make matters worse, the washerman or washerwoman can travel together but not with anyone of the other two couples. Each of the six can row the boat...

3 monkeys and 3 humans crossing river puzzle

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This time Three humans, one big monkey and two small monkeys are to cross a river in a boat that can carry at most two, only the humans and the big monkey can row the boat and most alarmingly—at all times number of monkeys must not become more than the number of humans on any bank of the river, Or else the humans will be eaten by the monkeys!....

Farmer with fox, goose and bag of corn crossing the river puzzle

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A farmer must cross a river with his pet fox, goose and bag of corn using a boat that is so small that he can take only one the three with him in a boat trip. Though he is ready to make as many trips as needed, he knows that the fox cannot be left alone with the goose, and the goose cannot be left alone with the corn....

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