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This video will talk about how to use the summation symbol. But before I do that, Im going to give you one of my favorite math jokes. That is, the square root of negative one, two to the third power, the summation symbol, and then the symbol for pi. Or, I Ate some pi. Translated to English: I ate some pie and It was delicious. Alright, but were actually here to talk about the summation symbol. This is the summation symbol. it is the capital Greek letter sigma, and it means either summation or addition. We never use the sigma symbol by itself. We never use the summation symbol by itself. At the bottom of the summation symbol will be an index. In this case, Im using the variable k. And wel give a starting value. I could start at zero. I could start at one, I could even start at negative 10. But Im going to start at zero for this example. On the top of the summation symbol will be another number. And thats going to be where were ending our summation. It could be a variable n. It
