PT66S2Q14 Forum

[Bigfish41]

Hi all, can someone please help me get through this question. It's a MBT, but don't see how i could connect the premises

anyway, here's the core:

Shown @ LNFF ---> Canadian Film

M
Film one prize at fest.----> won prize at international film fest.

I don't see how this two can be connected and don't see a contrapositive of the all statement in the ACs.

Thanks for your help =)

[js1663]

You have the first part correct:

Shown at LNFF ---> Canadian Film

They also tell us that most of the films Shown at LNFF won prizes at (a or the) IFF.

So let's go over what we know.

We know that all films at LNFF were Canadian, and among those at least 51% of the films, which again, are Canadian, won prizes at a IFF. So we know that some Canadian films must have won prizes at IFF.

What we don't know, and how they will try to trick you, is whether Canadian Films won > 51% of overall prizes, or anything of that sort. We just know that at least some of the winning films at the IFF were Canadian.

C is your perfect answer.

A is wrong because we don't know if most of the films that won at the IFF were Canadian. We know that 51%+ of LNFF films won at the IFF, but it could be there were 20 films at the LNFF and 100 prizes awarded. So 80% of prizes were not to LNFF films.

B is wrong because LNFF ---> Canadian does not mean Canadian ---> LNFF. Films can be Canadian and do not necessarily have to be shown at the LNFF. Only if they are shown at the LNFF we then know that they must be Canadian

D is wrong because we simply have no clue if it's true or not, so definitely not a must be true. it's not talked about in the information given beyond that at least 51% of films were shown at an IFF.

E is again wrong because we once again don't know yes or no. Could be only LNFF films won at IFF's or it could be not. We have no clue so again, not a must be true.

Also, just to go over something I noticed you did wrong.
Film's that won prizes at the LNFF did not necessarily win at IFF's. Only most (>50%) did. So you're written logic is wrong (unless the M above means most?). And there's no need for contrapositives here, it plays out quite well. Contra-positives for a "most" statement are essentially useless.

Example
Most Films that won Prize by LNFF ---> Won prize at IFF
Didn't win at IFF ---> Some films that won prize by LNFF
Would be the only way I can think of to write it but you learn and gain nothing and it's wrong anyways since didn't win at IFF doesn't tell you the necessary here for certain.

[Bigfish41]

Thank you sooo much js1663!! I got it now ! Read over THAT festival LNFF; shows how just missing a word can throw you off.

yah tried to put a most in the conditional statement. somehow the M ended up completely off lol

[Bigfish41]

You have the first part correct:


Example
Most Films that won Prize by LNFF ---> Won prize at IFF
Didn't win at IFF ---> Some films that won prize by LNFF
Would be the only way I can think of to write it but you learn and gain nothing and it's wrong anyways since didn't win at IFF doesn't tell you the necessary here for certain.

from what I remember, most statements don't have contrapositives. Was that you were getting at ^^^?

[js1663]

You have the first part correct:


Example
Most Films that won Prize by LNFF ---> Won prize at IFF
Didn't win at IFF ---> Some films that won prize by LNFF
Would be the only way I can think of to write it but you learn and gain nothing and it's wrong anyways since didn't win at IFF doesn't tell you the necessary here for certain.

from what I remember, most statements don't have contrapositives. Was that you were getting at ^^^?

Yes