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can someone please explain what these are and how they work in arthimetic and geometric sequences...
i just watched a video on it and it really threw me off and im confused again and i have an exam tomorrow on this :(

 Sep 20, 2019
 #1
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nevermind, i undertstand them now :)

 Sep 20, 2019
 #2
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wait why is this invisible...

 Sep 21, 2019

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