CR documentary videotapes

Question

Provide explanations please;sharing the approach of solving this question would be appreciated !

HIMALAYA · Answer

I go with A.

all are useful. some are boring. so some borings are not worthful because students do not pay attention to them.

ashkg · Answer

Could folks please provide the explanations ? :help2

Is there any particular way to solve this ?

kwasi7 · Answer

A for me. About the explanation the other options are just not true if you keep you mind on the reasoning.

The key here is knowing which documentaries are worth showing.

christoph · Answer

maybe it helps...

HIMALAYA · Answer

nice one. cris is expert in drawing...........

Darth_McDaddy · Answer

I am stuck between A and C, but ultimately I will go with A.

My reasoning :-
Consider documentaries that provide useful information as the whole set. 
Interesting documentaries is a subset, and this subset of videotapes are worth showing in school. Documentaries that are boring constitute another subset, and both these subsets are disjoint.

if you draw what I have conveyed above, you will find that you can eliminate B, D and E.

Finally between A and C. C assumes that some boring videotapes are worth showing, but one cannot make this assumption, as the CR doesn't provide any such clues. A uses all the facts provided by the CR, and is thus always correct.

HowManyToGo · Answer

Picked A over B , only because B sounded a bit extreme.

But I think that B is also correct as the stem says that "all videotapes give useful info" , so all tapes irrespective of being boring or not give "useful info".

HMTG.

christoph · Answer

the arg says that "documentary videos always provide useful info". that is different. thats why B) is wrong.

sparky · Answer

A. Some documentaries are boring but they always provide useful info =>
some videotapes that provide useful info are worth showing at schools

Propeties of a subset will always be a part of properties of a set that includes that subset.

AJB77 · Answer

B -> False because there could be videotapes that are boring but not documentary and may not provide useful info

C -> False - Worth showing in school means the tape is not boring.

D -> False, if something holds students' interest, it is 100% worth showing

E -> For a tape to be worth showing it is sufficient if it holds students interest

A is true because some documentaries are boring and not worth showing and documentaries MUST provide useful info.

CR documentary videotapes

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