Chapter 1.3, Problem 9E

To determine

To prove: That the argument given below is a valid argument.

$\begin{array}{l}{p}_1\to \left(q_1\to r_1\right)\\ p_2\to \left(q_2\to r_2\right)\\ \begin{array}{c}.\\ .\\ .\end{array}\\ .\\ p_n\to \left(q_n\to r_n\right)\\ q_1\wedge q_2\wedge \mathrm{...}\wedge q_n\end{array}$

$\left(p_1\to r_1\right)\wedge \left(p_2\to r_2\right)\wedge \mathrm{.....}\wedge \left(p_n\to r_n\right)$