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Trần Triệu Tân

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If b9bb7 - b9cbc = ca6 find number abc. Multiple solutions may exist.
In the following circles, the four outer numbers are used to calculate the number in the middle. Can you figure out the rule to determine what number should replace the question mark in the third circle?
How Many Squares Are There?

Tesla patent

In 1900, Nikola Tesla received a patent for the wireless transmission of electric power (No. 645,576).

I'm already planning...

I'm already planning to be an a$$hole on Monday!
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