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Random Puzzles


Difficulty: MediumPuzzle 1

Puzzle IconAre there more...

...2s or 8s in the numbers from 1 to 50,000?

[Ref: ZCMX]

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Direct Link: www.brainbashers.com?ZCMX


Difficulty: EasyPuzzle 2

Puzzle IconI have a drawer full of socks.

There are 5 socks of each colour, red and green, evenly mixed.

In the morning, when it is very dark, I need to pull out a pair of socks of the same colour.

How many must I pull out of the drawer to ensure that I have at least one pair of matching socks?

[Ref: ZDJR]

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Difficulty: MediumPuzzle 3

Puzzle IconMr Smith has lots of pound coins, ten boxes in all. Each box contains 100 pound coins, but one box contains coins which are all counterfeit and are slightly lighter, 1/16 of an ounce lighter to be exact.

The problem lies in the fact that they all look identical, the only way to tell them apart is to weigh them.

Mr Smith knows the correct weight for a box, but how many weighings are required to determine which box contains the counterfeit ones?

[Ref: ZJYH]

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Difficulty: EasyPuzzle 4

Puzzle IconWhat day would tomorrow be if...

...yesterday was five days before the day after Sunday's tomorrow?

[Ref: ZYFP] © Kevin Stone

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Direct Link: www.brainbashers.com?ZYFP

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