A math professor, (let’s call him Scotty) is having problems with his sink, so he calls a plumber. The plumber comes over and quickly fixes the sink. The professor is happy until he gets the bill. He tells the plumber, "How can you charge this much? This is half of my paycheck!”
The plumber tells him, "Hey, we’re looking for more plumbers. You could become a plumber and triple your salary. Just make sure you say you only made it to 6th grade, they don't like educated people."
The professor takes him up on the offer and becomes a plumber. His salary triples and he doesn't have to work nearly as hard. But one day the company makes an announcement that all of their plumbers must get a 7th grade education. So they all go to night school.
On the first day of night school they all attend math class. The teacher wants to gauge the class so he asks Scotty, "What is the formula for the area of a circle?"
Scotty walks up to the board and is about to write the formula when he dawns on him that he’s forgotten it. So he begins to attempt to derive the formula, filling the board with complicated mathematics. He ends up figuring out it is negative pi times radius squared. He thinks the minus doesn't belong so he starts over, but again he comes up with the same equation.
After staring at the board for a minute hears the other plumbers whispering to him, "Switch the limits on the integral!"
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