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I got this problem correct, but it took me a (valuable) minute or two longer than it should have.
Any suggestions for quick diagramming?

"My father likes turnips, but not potatoes, which he says are tasteless. So it is not true that whoever likes potatoes likes turnips.

The flawed reasoning in the argument above most closely resembles that in which one of the following?

*Correct answer: Although this recently published work of fiction has more than 75 pages, it is not a novel. Thus, it is not the case that all novels have more than 75 pages."

It is quite intuitive after looking at it again, but a suggestion for a quick diagram would be great.

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Cardozo - you have the idea right, but I think you could be a little more consistent with your variable definitions:

T: Liking Turnips
P: Liking Potatoes
Ex: Existential/Example/One Instance of

Ex(T & -P) thus -(P -> T)
When it is meant to be -(T -> P)
"It is not true that whoever likes turnips like potatoes."

_____________

N: Being a novel
P: Having 75 pages
Ex: Existential/Example/One Instance of

Ex(P & -N) thus -(N -> P)
When it is meant to be -(P -> N)
"It is not the case that everything over 75 pages is a novel."