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February 9th, 2019, 09:12 AM  #1 
Senior Member Joined: Dec 2015 From: somewhere Posts: 713 Thanks: 96  Expression problem
Does this make sense ? $\displaystyle n=\sum_{k=1}^{n} \frac{k}{k}$ . It is same as 1+1+1+... , ntimes but the expression inside the sum is 1 . 
February 9th, 2019, 10:39 AM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,575 Thanks: 1423 
I don't see anything wrong with that other than it should be mentioned that $k \neq 0$

February 9th, 2019, 02:31 PM  #3 
Global Moderator Joined: Dec 2006 Posts: 21,020 Thanks: 2255 
Possibly $n \geqslant 1$ and $n \in \mathbb{N}$ were also intended.

February 9th, 2019, 02:42 PM  #4 
Senior Member Joined: Sep 2015 From: USA Posts: 2,575 Thanks: 1423  

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