UPSKILL MATH PLUS

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Find the sum:
 
1. \(4-\frac{1}{n} + 4-\frac{2}{n} + 4-\frac{3}{n} + ... \) upto \(n\) terms
The sum of the terms \(=\) iiii.
 
 
2. \(\frac{a-b}{a+b} + \frac{3a-2b}{a+b} + \frac{5a-3b}{a+b}+...\) upto \(11\) terms
The sum of the terms \(=\) iiiiii+i.
 
[Note: Enter the coefficient and variable in separate answer box.]