GMAT 逻辑分析题 (8)

sdcar2010

If there is any fierce competition in the Asian Games in Guangzhou, the attending audience will be treated to a mesmerizing and memorable moment. But there will not be a mesmerizing and memorable moment unless there are diehard sports fans in the audience. To be a diehard sports fan, one must understand the spirit of sports.

Fierce competition --> m&m moment
m&m moment --> diehard fans
diehard fans --> understand the spirit of sports.

Inference:
1) Fierce competition --> diehard fans
2) Fierce competition --> understand spirit of sports
3) m&m moment --> understand the spirit of sports

jeffxu

Scar2010,

Thank you very much for all the examples and the series of posts about CR.

I don't agree with you on this question.
Fierce competition --> m&m moment
m&m moment --> diehard fans
diehard fans --> understand the spirit of sports.

My understanding is that, fierce competition is a kind of objective phenominon but only people who're diehard fans can recognize it and enjoy it. To become a diehard fans you've to understand the sprit of sports.

So two parallel premises:
1, fierce competition
2, diehard fans
together treat the audience with m&m.

I agree that If there are NOT diehard sports fans in the audience, then there will not be a mesmerizing and memorable moment. But I disagree that "If there are no diehard sports fans in the audience, then there will be no fierce competition in the Asian Games in Guangzhou."

sdcar2010

Fierce competition --> m&m moment
m&m moment --> diehard fans

If you acknowledge the above premises, then their contrapositives are correct:
No diehard fans --> No m&m moment
No m&m moment --> No fierce competition

Therefore, No diehard fans --> No fierce competition

For formal logic questions in CR, do not add your own objective/subjective opinions to the logic chains in the passage. Remember, we are analyzing the author's logic reasonings here, not yours. ONLY focus on the logic statements in the passage and go from there.

AlohaDJ

Thks NN for the explanations.

My summary from this question:
1. A unless B: A ->B (after UNLESS is a necessary condition)
2. To / in order to represents the if-part in if-then statements.

sdcar2010

Thks NN for the explanations.

My summary from this question:
1. A unless B: A ->B (after UNLESS is a necessary condition)
2. To / in order to represents the if-part in if-then statements.

-- by 会员 AlohaDJ (2011/8/10 1:37:05)

A unless B:   Not A --> B (You have to negate the claim in A to make it a sufficient condition).

Not A unless B: A --> B

AlohaDJ

Thks NN for the explanations.

My summary from this question:
1. A unless B: A ->B (after UNLESS is a necessary condition)
2. To / in order to represents the if-part in if-then statements.

-- by 会员 AlohaDJ (2011/8/10 1:37:05)

A unless B:   Not A --> B (You have to negate the claim in A to make it a sufficient condition).

Not A unless B: A --> B

-- by 会员 sdcar2010 (2011/8/10 2:35:13)

oh..YES!! Negation of A is indispensable here!
THKS NN for pointing it out!!

jeffxu

Thank you sdcar2010.I was also wondering that I may take some of my own opinions into account for this question.

Fierce competition --> m&m moment
m&m moment --> diehard fans

If you acknowledge the above premises, then their contrapositives are correct:
No diehard fans --> No m&m moment
No m&m moment --> No fierce competition

Therefore, No diehard fans --> No fierce competition

For formal logic questions in CR, do not add your own objective/subjective opinions to the logic chains in the passage. Remember, we are analyzing the author's logic reasonings here, not yours. ONLY focus on the logic statements in the passage and go from there.

-- by 会员 sdcar2010 (2011/8/9 22:04:06)

corrine90

sdcar, I have a question about the trigger. Is it something that appears in the stimulus? I saw you say sufficient conditon, so I think the trigger must appear as it does in the stimulus, am I right?

sdcar2010

sdcar, I have a question about the trigger. Is it something that appears in the stimulus? I saw you say sufficient conditon, so I think the trigger must appear as it does in the stimulus, am I right?

-- by 会员 corrine90 (2011/8/20 9:52:35)

That's right. The trigger is the sufficient condition in a logic statement. Because without the trigger, you won't logically reach the necessary condition.