@anulirz

Your mistake is including the conditional indicator as part of one of the two items in problem 3.

In "None of the Americans attended the dictator's party" the conditional indicator is "none" and the two items are [Americans] and [attended dictator's party]. So according to group 4 indicator rules we make either one negative and place as the necessary condition, as you did (ADP --> /A). Notice that "none" (the conditional indicator) is not changed or included as part of the item, it is what is represented by the arrow in the Lawgic, essentially.

In Question 3, "No sales technique can succeed that does not get the potential buyer to emotionally connect with the product being sold" the conditional indicator is the first word "No" and the two un-altered items become [succeed] and [NOT emotionally connect]. SO, when we do our Group 4 indicator rule, "negate, necessary", we make one item negated ([NOT emotionally connect] becomes [Emotionally connect]) and [succeed] stays the same. This give us

Succeed --> emotionally connect

Or contrapositive

/emotionally connect --> /succeed

The strongest arguments do nor provide room for any other conclusion to be true, as is in the Disney argument.

The Tiger argument has premises that are essentially always true, but COULD rarely not the case in certain extenuating circumstances. For instance if someone WANTED their pet to cause injuries to some people, then the conclusion is no longer supported.

The Detective argument is the weakest because while the premises are suggestive and consistent with the conclusion, there is still a strong possibility the cat could be innocent.

Not all junk food is completely bad for you. For instance, greasy cheeseburgers made from ground beef are high in protein.

The owner of the toy store only sells toys to people with a green or blue shirt on. The owner sold toys to Jack. Jack is not wearing a blue shirt. Thus, Jack must have been wearing a green shirt when he purchased the toys.

The Brita in the office is empty. The brita is kept inside the refrigerator. Jack is standing next to the refrigerator drinking a glass of water. Therefore, Jack must have emptied the Brita.