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| This page is about all sorts of puzzles that use numbers and their manipulation. |
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| Magic square | |
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Rearrange these cards so that each vertical, horizontal and diagonal line of three cards adds up to the same number.
Move the mouse over the image to see the solution. |
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| Balls | Solution |
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This is a well known probability puzzle that seems so obvious you might want to take a couple of minutes before you check out the answer.
Four coloured balls are placed in a bag, two of them are red, one is white and one is blue. Two balls are drawn at random from the bag and the person drawing them says that at least one of them is red. What is the probability that the other one is red? |
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| Cards | Solution |
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Another probability puzzle. This one made a fortune for unscrupulous card sharks in the Californian gold rush.
There are three cards, one that is gold on both sides, one that is silver on both sides and one that has one silver side and one gold side. All three cards are put into a bag and one is drawn out at random. Let's assume that it is gold side up. The card sharp would then say that since there is one card with gold on both sides and one card with a gold and a silver side it is obviously an even money bet that the other side would be gold. He would then offer that bet to the punters who would lose more often than they would win. Why? |
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| Number series | Solution |
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What is the next row in this series?
1 1 1 2 1 1 2 1 1 1 1 1 2 2 1 3 1 2 2 1 1 1 3 1 1 2 2 2 1 |
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| Fives | |
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Add one line to the sum on the left to make it correct.
Move the mouse over the image to see the solution. |
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