+0  
 
0
798
2
avatar+642 

1.

 

 

 

 

2

.

 Mar 21, 2019
 #1
avatar+37146 
0

https://web2.0calc.com/questions/help-plz-sigma-notations-a-bit-hard-for-me

 Mar 21, 2019
 #2
avatar+118673 
+1

Thanks EP  laugh

 Mar 21, 2019

3 Online Users

avatar