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Random Puzzles 


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Puzzle 1 


What 5-digit number am I thinking of?

It has two prime digits. Digit 3 is the highest digit. Digit 2 is the lowest digit. Digit 1 is higher than the sum of digits 4 and 5. Digit 5 is half of digit 4. Digit 1 is one smaller than digit 3. Digit 5 is between digit 2 and digit 1
The digit 0 doesn't appear, and there are no duplicates. Don't forget that 1 isn't prime, as the prime numbers start with 2, 3, 5, …

Puzzle Copyright © Kevin Stone

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Puzzle 2 


What comes next in this sequence:

boron · carbon · nitrogen · oxygen · ?

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Puzzle 3 


Using the letters AAEENNPPPPSS complete this grid. The grid reads the same across and down.

Note: this puzzle is not interactive, and the squares cannot be clicked.

Puzzle Copyright © Kevin Stone

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Puzzle 4 


What four related items have been merged together?

cop enk eac uco nta rnm uqi nut uat et

Puzzle Copyright © Kevin Stone

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