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- Question 2 Exercise 4.3
- s & 4 n^2-11 n-225=0\end{align} This is quadratic equation with $a=4, b=-11$ and $c=-225$, then \begin{align
- Question 5 & 6 Exercise 4.5
- Putting both the $S_{10}$ and $S_S$ in the given equation, we get\\ \begin{align}\dfrac{a_1(r^{10}-1)}{r-1}
- Question 11 & 12 Exercise 4.5
- )^{p-q}.\end{align}\\ Multiplying the above three equations\\ \begin{align}a^{q-r} b^{r-p} c^{p-q}& =(a_1 r^