10. Five marks exercise problems V

1. Find the sum $\left[\frac{a-b}{a+b}+\frac{3a-2b}{a+b}+\frac{5a-3b}{a+b}+...\mathit{to}12\mathit{terms}\right]$.

 

Answer:

 

The sum \(=\) $i\left[\frac{ii-ii}{i+i}\right]$

 

[Note: Enter coefficients and variables in the separate boxes.]

 

 

2. A man saved \(₹16500\) in ten years. In each year after the first, he saved \(₹100\) more than he did in the preceding year. How much did he save in the first year?