Expanding on the logic riddle:

[Toddsterpatriot]

In choosing whether the other card is red, you are now forced to choose between three equally likely choices as one possible permutation has been removed from the set:

{BR, RB, RR}

What is now the probability that both cards are red?

1/3

Until you flip over a red one. Now it's 50%.

 

[Fort Fun Indiana]

Equivalent, both 50% chances.

No.

 

[Fort Fun Indiana]

Until you flip over a red one. Now it's 50%.

No.

 

[Toddsterpatriot]

No.

When you flip a red card, what possibilities are left?

 

[Toddsterpatriot]

What is your logic behind scenario #3 not being 50/50? Drawn from an infinite deck of equal colors, every card drawn would have a 50% chance of being one color or the other, regardless of the scenario in which they were drawn.

He made the same errors in the sibling riddle........

Riddles

First one: You meet a girl. She tells you she has one sibling. What are the odds her sibling is also a girl?

www.usmessageboard.com

 

[Fort Fun Indiana]

When you flip a red card, what possibilities are left?

In scenarios 3 and 4?



BR
RB
RR

 

[Fort Fun Indiana]

He made the same errors in the sibling riddle........

Riddles

First one: You meet a girl. She tells you she has one sibling. What are the odds her sibling is also a girl?

www.usmessageboard.com

No, I assure you that you did. These are well known problems, for discrete math students.

And nearly all of them make the same errors you are making. Until they learn why they are errors.

 

[Toddsterpatriot]

In scenarios 3 and 4?



BR
RB
RR

BR
RB
RR

In scenario 3, which card did you flip, the first one above, or the second one?

 

[Toddsterpatriot]

No, I assure you that you did. These are well known problems, for discrete math students.

And nearly all of them make the same errors you are making. Until they learn why they are errors.

Feel free to post a textbook showing your proof.

 

[Fort Fun Indiana]

In scenario 3, which card did you flip, the first one above, or the second one?

"first one above"

Not sure what that means.

But it is irrelevant which of the two cards you flip first, in scenarios 3 and 4.

If I choose two cards from the infinite deck, shuffle them, and place them facedown in front of you, it does not matter which card is flipped first. The only information that is revealed to you is the color of the card that is flipped.

 

[Fort Fun Indiana]

Feel free to post a textbook showing your proof.

Nah, I would rather you understand the reasoning, instead of taking it on authority. I am trying to teach you the solution, not program you.

 

[Toddsterpatriot]

Nah, I would rather you understand the reasoning, instead of taking it on authority. I am trying to teach you the solution, not program you.

Still can't admit your error......

 

[Fort Fun Indiana]

Still can't admit your error......

This complaining is not going to help you.

Oh well, I did my best.

Next.

 

[Toddsterpatriot]

"first one above"

Not sure what that means.

But it is irrelevant which of the two cards you flip first, in scenarios 3 and 4.

If I choose two cards from the infinite deck, shuffle them, and place them facedown in front of you, it does not matter which card is flipped first. The only information that is revealed to you is the color of the card that is flipped.

Not sure what that means.

Reading, left to right. The first one?

BR
RB
RR

Or the second one?

BR
RB
RR

 

[Toddsterpatriot]

This complaining is not going to help you.

Oh well, I did my best.

Next.

You still haven't shown your proof, from a textbook "for discrete math students"

 

[Fort Fun Indiana]

Not sure what that means.

Reading, left to right. The first one?

BR
RB
RR

Or the second one?

BR
RB
RR

Those ordered permutations do not describe the way the cards are laid in front of you.

 

[Fort Fun Indiana]

You still haven't shown your proof, from a textbook "for discrete math students"

Nor will I. I have given you the information that anyone can use to understand the problem and the solution.

 

[Toddsterpatriot]

Those ordered permutations do not describe the way the cards are laid in front of you.

You described the way. In post #22.

 

[Toddsterpatriot]

Nor will I. I have given you the information that anyone can use to understand the problem and the solution.

I know you won't. Because you're wrong.

 

[Toddsterpatriot]

If I choose two cards from the infinite deck, shuffle them, and place them facedown in front of you, it does not matter which card is flipped first. The only information that is revealed to you is the color of the card that is flipped.

Right. The first card was red.

What color is the second card?

Either red or black. 50/50