/sci/ - Science & Math

Anonymous Mon May 4 13:49:55 2020 No.11636665 [View]
File: 21 KB, 590x175, c63c841b962ee205d8b5959866dd78a9.png [View same] [iqdb] [saucenao] [google]

Can someone explain/expand how he got from the 2nd step to the last step? I know that he's using the ratio test but I don't understand the steps in between those two. (2nd to 3rd step as in the last two equations where he got the answer 1/4).

Anonymous Mon May 4 13:48:12 2020 No.11636658 [DELETED]

[View]
File: 21 KB, 590x175, c63c841b962ee205d8b5959866dd78a9.png [View same] [iqdb] [saucenao] [google]

Can someone explain/expand how he got from the 2nd step to the 3rd step? I know that he's using the ratio test but I don't understand the steps in between those two. (2nd to 3rd step as in the middle two equations).

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/sci/ - Science & Math

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