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**pepsiman3000** · 11-04-11, 07:46 PM

Originally Posted by Braineater XO

Lol, you're making this way too hard then what it seems. The correct answer is 25% cause you only have 4 options to choose from. 1/4 chance of winning.

I was really good at probability in school. ;]

Ok, I'm pretty good at probability in school now.

I tried to make it as simple as I could, any answer deviates another being correct.

Did you read the answers to the question?

Reread the question and my earlier statement in level I.

**Kanati** · 11-05-11, 06:38 PM

ok ok ok .... I'll post the answer.

**Kanati** · 11-05-11, 06:41 PM

The answer I came to after my brain went into vapor-lock is basically what a couple of you came up with as well.

It's a "trick" question because it's recursive. Or to be more specific. It's Russell's Paradox and is based on "naive set thoery".

According to naive set theory, any definable collection is a set. Let R be the set of all sets that are not members of themselves. If R qualifies as a member of itself, it would contradict its own definition as a set containing all sets that are not members of themselves. On the other hand, if such a set is not a member of itself, it would qualify as a member of itself by the same definition. This contradiction is Russell's paradox. Symbolically:

All I know is that it made me get a headache thinking about it for about 10 minutes before coming to the conclusion that mathematicians all suck.

**braineater xo** · 11-05-11, 07:58 PM

These little math problems are fun!

**DistrictAJ** · 11-11-11, 09:53 AM

I'm currently taking some differential and integral calculus classes to help with my economics/finance major. I didn't realize how much I like math until now, lol.

Originally Posted by Braineater XO

These little math problems are fun!

I now say that quite often, and I've come to realize how much my high school self would be beating me up by now.