Any syllogism expert on here?

This syllogism exercise is driving me nuts.

"I know that all fundamentalist Christians are evangelicals, and I'm pretty sure that all revivalists are also evangelicals. So, if I'm right, at least some fundamentalists Christians must be revivalists."

Fundie Xtians = P
Evangelicals = M
Revivalists = S

All P are M
All S are M
Some P are S
-> AAI-1.

According to the internets, AAI-1 is one of the 24 valid forms, but on my professor's list there's only 15, so one of them has to be incorrect. Now I need your input as to determine if AAI-1 is a valid form.

 

uh.... wat.

 

This Crit Thinking class is a total mindfk :[

 

"at least some fundamentalists Christians must be revivalists"

ur wrong, let me draw it

edit: here, take a look, they never have to overlap

 

Ehh, that's the original problem. I can only draw out the syllogism involved and determine if the given problem is true or false :[

 

look at the edit

 

I just finished a Venn on my end too. They don't look like they're matching up to make a valid form either.
Then does it mean that some sources are contradicting themselves?

 

ur just making an assumption, they can overlap but not necessarily

also idk what AAI-1 stands for and idk what it is ur really looking for. if u explain a little bit more itll make it easier

 

There are 4 forms of premises and conclusions:
- A = All _ are _
- E = No _ are _
- I = Some _ are _
- O = Some _ are not _

The blanks are there to fill in P, M, S (for premises), or just P and S (for conclusions).

Based on the arrangements of P, M, and S in the premises, we have the moods labeled from 1-4

1. M P
S M
2. P M
S M
3. M P
M S
4. P M
M S

For example, consider this problem:

"Everybody on the district tax roll is a citizen, and all eligible voters are also citizens. So, everybody on the district tax role is an eligible voter."

P = everybody on the tax role
M = is a citizen
S = eligible voter

"Everybody on tax role is a citizen" = All P are M = A
"All eligible voters are citizens" = All S are M = A
"Everybody on tax role is an eligible voter" = All S are P = A
Mood = 2 => AAA-2

Now, there's a list somewhere that states how many valid XXX-X forms are there out of 256 possible combinations, but my professor's and the internet's contradict each other when it comes to the form mentioned above: AAI-1, so I'm trying to get some more inputs.

Seems like it's an invalid form so far.

 

lol i see another problem in the example u just posted, ur doing it again



it means SOME on the tax roll r eligible voters, NOT all

note: citizen and tax roll can be the same circle, doesnt change the fact that eligible voters can be smaller, therefore there r others who r not eligible

the argument would have to say that all citizens r eligible voters for that to be true, not that all eligible voters r citizens

 

Hence, that's why I said the form AAA-2 is invalid, and thus resulted in a false claim.

 

man i can do the logic part but theres no way ill understand the freaky symbol labels

 

Ikr :[

/10charrrrrrrrrrr

 

ooooh now i get it xD and nope, its not a valid form due to the fact that its based on an assumption (cant know for sure) and if the assumption is different (like the chart i drew) it would be wrong. so yea AAI-1 is invalid

it is sometimes valid and sometimes not, since it doesnt always hold true, say invalid