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What did 2n-1 say to 2n?
Add me to myself and multiply by 4. Divide me by 8 and you will have me once more. What number am I?
In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?
How can you make six into an odd number?
A tree with 5 branches, no leaves and no fruits
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