Riddle and Puzzle Thread

[dkmago]

another  - I have a number in mind.  It's either 1, 2, or 3.  Guess my number - you can ask me one question and I'll answer it 'yes', 'no', or "I don't know"

(goal - find a question that gives you the right answer no matter which number I chose)

Answer:  I'm thinking of a number between 1 and 2.  Is your number greater than the number I'm thinking of?

Responses

Yes = your number is 3

I don't know = your number is 2

No = your number is 1

[14ledo81]

The old rich lady finally died. She hid her fortune of diamonds inside of a cylinder surrounded by 1000 squares. Where is it?

[David in FL]

The old rich lady finally died. She hid her fortune of diamonds inside of a cylinder surrounded by 1000 squares. Where is it?

I've been thinking about this all morning.  I was just in the grocery store buying dinner and other sundry items.......

......is it a roll of paper towels?

[tmac20]

I've been thinking about this all morning.  I was just in the grocery store buying dinner and other sundry items.......

......is it a roll of paper towels?

Or more likely, toilet paper.

[David in FL]

Or more likely, toilet paper.

Damn, you're probably right.  I wasn't buying TP though!

[14ledo81]

[QUOTE name="14ledo81" url="/t/71500/riddle-and-puzzle-thread/144#post_945632"] The old rich lady finally died. She hid her fortune of diamonds inside of a cylinder surrounded by 1000 squares. Where is it?[/QUOTE] I've been thinking about this all morning.  I was just in the grocery store buying dinner and other sundry items....... ......is it a roll of paper towels?

[quote name="tmac20" url="/t/71500/riddle-and-puzzle-thread/120#post_945724"][QUOTE name="David in FL" url="/t/71500/riddle-and-puzzle-thread/144#post_945722"]   I've been thinking about this all morning.  I was just in the grocery store buying dinner and other sundry items....... ......is it a roll of paper towels? [/QUOTE] Or more likely, toilet paper. [/quote] Either one works.. I was thinking TP so Tmac is up.

[tmac20]

I'm up? Okay, how about a math puzzle, because I know everyone here loves math.

I am going to prove that 1=2, and you have to tell me why it's wrong.

Let a=b.

So, a ² =ab.

Add a ² to both sides of the equation.

a ² +a ² =ab+a ²

2a ² =a ² +ab

Subtract 2ab from both sides of the equation.

2a ² -2ab=a ² +ab-2ab

2a ² -2ab=a ² -ab

2 (a ² -ab) = a ² -ab

(Since a ² -ab=a ² -ab, we can cancel these terms in the equation.)

2=1

[Harmonious]

I'm up? Okay, how about a math puzzle, because I know everyone here loves math.

I am going to prove that 1=2, and you have to tell me why it's wrong.

Let a=b.

So, a2=ab.

Add a2 to both sides of the equation.

a2+a2=ab+a2

2a2=a2+ab

Subtract 2ab from both sides of the equation.

2a2-2ab=a2+ab-2ab

2a2-2ab=a2-ab

2(a2-ab)=a2-ab

(Since a2-ab=a2-ab, we can cancel these terms in the equation.)

2=1

Once you subtract 2ab from both sides, then both sides become zero. 2 times zero equals 1 times zero.

Good problem.

[tmac20]

Once you subtract 2ab from both sides, then both sides become zero. 2 times zero equals 1 times zero.

Good problem.

Yup, you're right.

[Always an 80]

Next riddle please?! I like this thread. I answer all of the riddles but keep the answers to myself. ( HAR! ) I only know the answers to my own. But at my age I cannot even remember the riddles.

[MiniBlueDragon]

You have a choice of 3 cups, one of which has a diamond underneath it and the other two have nothing.

You choose any one of the cups.

One of the other two cups is turned upside-down to reveal nothing.

Do you stick to your original choice or swap to the other cup to give you the greatest probability of winning the diamond? Explain why. :)

[iacas]

You have a choice of 3 cups, one of which has a diamond underneath it and the other two have nothing.

You choose any one of the cups.

One of the other two cups is turned upside-down to reveal nothing.

Do you stick to your original choice or swap to the other cup to give you the greatest probability of winning the diamond? Explain why. :)

Paging a famous game show problem… ;-)

[MiniBlueDragon]

Quote:

Originally Posted by MiniBlueDragon

You have a choice of 3 cups, one of which has a diamond underneath it and the other two have nothing.

You choose any one of the cups.

One of the other two cups is turned upside-down to reveal nothing.

Do you stick to your original choice or swap to the other cup to give you the greatest probability of winning the diamond? Explain why. :)

Paging a famous game show problem… ;-)

SSshhhhh! ;)

[Always an 80]

It is not still a fifty fifty? Boy I must be daft!

[Golfingdad]

You have a choice of 3 cups, one of which has a diamond underneath it and the other two have nothing.

You choose any one of the cups.

One of the other two cups is turned upside-down to reveal nothing.

Do you stick to your original choice or swap to the other cup to give you the greatest probability of winning the diamond? Explain why. :)

I find the way you word the question to be odd.  It almost looks like it answers itself.  I think you probably should say:  To give yourself the greatest possibility of winning the diamond, do you stick to your original choice, or swap to the other cup, or does it matter?  Or something like that.  As its written, it sounds like your asking me if I want to keep my choice or have a greater possibility of winning.

I guess that could have multiple answers too.  If I have a clingy girlfriend that keep asking me "when are we gonna get married?" or if I know that the diamond is stolen, then perhaps I'd stick to my original choice.

Paging a famous game show problem… ;-)

One which I pushed back against for quite a while.  It just made no sense ... until it finaly made all the sense in the world.

[saevel25]

You have a choice of 3 cups, one of which has a diamond underneath it and the other two have nothing.

You choose any one of the cups.

One of the other two cups is turned upside-down to reveal nothing.

Do you stick to your original choice or swap to the other cup to give you the greatest probability of winning the diamond? Explain why. :)

(Edit I got it wrong)

You choose the other cup, because its still 3 cups, so its now 2/3 chance. If you keep the original its 1/3 because you didn't change anything.

Paging a famous game show problem… ;-)

LOL

[David in FL]

Paging a famous game show problem… ;-)

Monty, Monty......

[Always an 80]

So how then do we solve the problem of the clingy girlfriend? That was the next one right?!