Adster wrote:Porn movie!
Are there three princesses in it?
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lamexorleet wrote:My Question would be :
"
Do you sometimes tell the truth XOR is it correct than neither of your sisters always tell the truth ?"
The flip-flopper would answer yes both consistent girls would answer no.
If only the suitibility of all offerant partners could be decided by boolean logic.
Will she be my eXclusive OR tonite ?
sulayman wrote:Not necessarily. The middle sister could also answer "I don't know" in reference to herself. It would work as either an honest or dishonest answer.
karmadillo wrote:It's simple...
Ask sister 1 if sister 2 lies more than sister 3.
If answer is yes: pick sister 2
If answer is no: pick sister 3
sulayman wrote:karmadillo wrote:It's simple...
Ask sister 1 if sister 2 lies more than sister 3.
If answer is yes: pick sister 2
If answer is no: pick sister 3
I'm lost. If you don't know which of the sisters lies, truths, and flipflops, how can you know that "Sister 1" isn't a viable option.
What if Sister 1 is the Honest Sister? She'd answer "Yes" if Sister 2 were the Liar, and "No" if Sister 2 were the flipflopper. And in either case, you'd be picking the wrong sister.
karmadillo wrote:It's simple...
Ask sister 1 if sister 2 lies more than sister 3.
If answer is yes: pick sister 2
If answer is no: pick sister 3
jpark wrote:skeptical scientist,
I thought the puzzle stated the middle sister made a choice to tell the truth or to lie. This is an either/or situation. The situation you postulate is a mixture of truth and falsehood.
If we allow the middle sister to do both, we diverge from the rules of the puzzle.
gmalivuk wrote:You have to find out which is the oldest or the youngest. Knowing the one you asked is the oldest or middle doesn't help you.
gmalivuk wrote:And to skeptical scientist, I would assume that the middle sister must decide beforehand whether she will lie or tell the truth. (It's not her answer that's random, but whether she tells the truth. These are different cases.)
gmalivuk wrote:Otherwise, there isn't a solution.
jjoseph_x wrote:karmadillo wrote:It's simple...
Ask sister 1 if sister 2 lies more than sister 3.
If answer is yes: pick sister 2
If answer is no: pick sister 3
The problem is that you don't know which one is sister 3 or sister 2.
Let's say that sister 3 is the middle one and that sister 2 is the eldest. If you ask the lier your question, she'll answer "no" (since the middle does lie more, and the lier will...well... lie), so you pick sister 3 (the one that you wanted to avoid).
karmadillo wrote:jjoseph_x wrote:karmadillo wrote:It's simple...
Ask sister 1 if sister 2 lies more than sister 3.
If answer is yes: pick sister 2
If answer is no: pick sister 3
The problem is that you don't know which one is sister 3 or sister 2.
Let's say that sister 3 is the middle one and that sister 2 is the eldest. If you ask the lier your question, she'll answer "no" (since the middle does lie more, and the lier will...well... lie), so you pick sister 3 (the one that you wanted to avoid).
Umm, you failed to follow your own reasoning. In your counterexample:
Sister 1 = youngest, Liar
Sister 2 = eldest, Truthful
Sister 3 = middle, Random
So my answer says "ask sister 1 (liar) if sister 2 (truthful) lies more than sister 3 (random)". Since sister 1 is a liar, she answers falsly "Yes, sister 2 (truthful) lies more than sister 3 (random)", not "No" as you had her reply in your post.
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