Worked example: arithmetic series (sigma notation) | High School Math | Khan Academy

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Sal evaluates the arithmetic series Σ(2k+50) for k=1 to 550. He does that using the arithmetic series formula (a₁+aₙ)*n/2.

High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.

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All tutors from Khan Academy have all the respect that I am capable of! Thank you!

turcugeorge
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Wow ! Thanks a lot .... I learned so much in this channel

adrianeilsantos
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Mais c’est magique : tu cumules le 1er nombre de la série arithmétique au dernier, tu multiplies par le nombre de nombres de la série arithmétique, tu divises par deux et, tu obtiens le cumul de tous les nombres de la série arithmétique.

alainhegelen
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Im in Gr 8 and this tbh is the best explained work ever!

isabellepretorius