I DID THE SAME THING

Hi - the thread below talks about this, actually!

This one really confused me but I think it was because I made an assumption that is not correct and I'll share in case some other people did so too.

Previously they told us the rule of (simplified for ease): A + B + C + D -> E

But then in P's example we see:

premise: pA + pB

conclusion: pC + pD -> pE

My mistake was that I used the logic of the rule we were told in the lesson previously. What I should have done is consider p's premise/conclusion without the previous rule.

with p's premise/conclusion alone we see that somehow we are supposed to be convinced that pC + pD -> pE with no connection from pA + pB.

SOOOO we would need the previous rule for it to make sense and for there to be the connection between (pA + pB) AND (pC + pD -> pE) because p's scenario doesn't give us that, which is the missing rule

After it's KIUd, it says

premise: A + B + C + D

conclusion: E

but how did we get there? hence, the missing rule.

The missing rule is the A + B + C + D -> E because now all the pieces are connected, which P's part didn't do

If this is totally off base please let me know lol! But maybe my confusion can help someone else

I just got 3/5 then went over the explanations and did the same difficulty again and got 5/5. That 3/5 is good because it shows you what kinds of questions within this that you struggle with and helps narrow down your studying. You've got this!

I thought the same thing but I think it's only negate sufficient because cannot is used to be /J instead of an indicator so when made negated sufficient it's //J -> PED which makes it J-> PED

It always is sufficient on the left and necessary on the right.

sufficient → necessary

I always think of the example he used of cat → animal

Being a cat is sufficient to make you an animal (As in, if you are a cat you are automatically an animal) but it is not necessary to be an animal (because you don't have to be a cat to be an animal, you can be a monkey or a horse etc.)

However, being an animal is necessary to be a cat because you cannot be a cat without being an animal.

I'd recommend going back to rewatch the lesson that goes over that, I regularly rewatch lessons I'm fuzzy on. Hope this helps!