$($a$)$ Use the method of conditional proof to $($BOC$)[$CA VB$)>($CVA$)]$

Use the Strengthened method of conditional Proof to prothenede validity of the following argument:

CE VE$)$ G H$($I$.$J$)($EDG$)($H

$($C$)$ Symbolize the following argument by using the suggested notations;

$66$ Only salesmen are retailers. Not all retailee are travelers. Therefore, some salesmen are hot travelers$\mathrm{.}99$

CSxix is a salesman Rx :x is a retailer

Tx: x is a traveler$)$

$($d$)$ Prove the validity of the following argument by using quantification theory:

Cx$)($DxGx$)$

Sm

Dm

: $($XXSxGX$)$