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The proverb "No pain, no gain," in the full form of a sentence, can be rewritten as "If you do not suffer any pain, then you will not gain any ...

I have 2 sets such that:

Starting with a number, the following is called the Collatz rule:

I have three numbers, and the product of any two of the numbers is equal to the other remaining number: ...

I've partitioned a regular hexagon into 2 identical quadrilaterals, as shown below. If the perimeter of one of these quadrilaterals is 5, what is the perimeter of the original ...

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