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Math and logic riddle thread
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ChanieMommy




 
 
    
 

Post Tue, Sep 22 2020, 4:01 pm
SixOfWands wrote:
Dude 1 had Santa's physique, and took most of the soot with him. Dude 2 was svelte, went straight down the middle without touching a thing.



Applause Applause Applause Applause Applause Applause Applause
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ExtraCredit




 
 
    
 

Post Tue, Sep 22 2020, 4:02 pm
malki2 wrote:
Here’s one:

What group of seven things is described by the following?
Long, short, white, black, his, hers, theirs.

Hidden: 

7 days of the week? Don’t ask me why. I’ll let you elaborate. Or shivas haminim.
.
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malki2




 
 
    
 

Post Tue, Sep 22 2020, 4:18 pm
ExtraCredit wrote:
Hidden: 

7 days of the week? Don’t ask me why. I’ll let you elaborate. Or shivas haminim.
.


Nope. Keep trying. But it is Jewish-themed. (I probably gave it away now.)
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ChanieMommy




 
 
    
 

Post Tue, Sep 22 2020, 6:25 pm
ExtraCredit wrote:
Hidden: 

I think there are 23 people. She entered the room after it already had 22. I don’t get why there’s a 50% chance that out of 365 days 2 should have the same birthday.


That might look a bit complicated, but it is kind of similar to the russian roulette with remixing...

Hidden: 

For the russian roulette, we had 5/6 chances of survival at the first try, 5/6 * 5/6 for the second try,
5/6 * 5/6 * 5/6 for the third, etc...

Now for the birthday, we have 365/365 chances of not having the same birthday as anyone else for the first person (because there is only one person, only one birthday, no sharing).

The second person has a chance of 364/365 * 1 of not having the same birthday, since this person could pick from the 364 remaining days so as not to have the same birthday.

the third person has a chance of 363/365 of not having the same birthday as either of them, and together they have a chance of 363/365* 364/365* 365/365 that no-one shares birthdays.

So the 23rd person has a chance of 342/365 of not sharing a birthday with any of the other ones, and together they have a chance of 365*364*363*....* 343/36523 that no-one shares birthdays...
And if you calculate that, you get 49%, which means that the have a little over 50% chance to share a birthday...

If this was not clear enough, here is a youtube video...



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pause




 
 
    
 

Post Tue, Sep 22 2020, 7:07 pm
malki2 wrote:
Here’s one:

What group of seven things is described by the following?
Long, short, white, black, his, hers, theirs.

Hidden: 

The seven yomim tovim of the year?
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malki2




 
 
    
 

Post Tue, Sep 22 2020, 7:30 pm
pause wrote:
Hidden: 

The seven yomim tovim of the year?


Getting warmer. When you get the right answer you will figure out the explanation.
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pause




 
 
    
 

Post Tue, Sep 22 2020, 7:36 pm
malki2 wrote:
Getting warmer. When you get the right answer you will figure out the explanation.

I was thinking YK is white, Purim is hers, Chanuka is his, Sukkos is long, Shavuos is either theirs or short, but I couldn't figure out the rest...
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malki2




 
 
    
 

Post Tue, Sep 22 2020, 7:40 pm
pause wrote:
I was thinking YK is white, Purim is hers, Chanuka is his, Sukkos is long, Shavuos is either theirs or short, but I couldn't figure out the rest...


A drop warmer. The first one is correct. Now you should get it.
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doodlesmom




 
 
    
 

Post Tue, Sep 22 2020, 8:28 pm
malki2 wrote:
A drop warmer. The first one is correct. Now you should get it.

Hidden: 


Fast days
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penguin




 
 
    
 

Post Tue, Sep 22 2020, 8:33 pm
Quote:
Long, short, white, black, his, hers, theirs.

I've heard it before I think.

Hidden: 

Fast days. 17 Tammuz is the longest? Asara B'Teves is the shortest.

His - Tzom Gedalay
Hers - Taanis Esther
Yom Kippur - white
Tisha B'av - black

But I seem to be missing one.
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malki2




 
 
    
 

Post Tue, Sep 22 2020, 8:33 pm
doodlesmom wrote:
Hidden: 


Fast days


Hooray Hooray Hooray
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malki2




 
 
    
 

Post Tue, Sep 22 2020, 8:34 pm
penguin wrote:
Quote:
Long, short, white, black, his, hers, theirs.

I've heard it before I think.

Hidden: 

Fast days. 17 Tammuz is the longest? Asara B'Teves is the shortest.

His - Tzom Gedalay
Hers - Taanis Esther
Yom Kippur - white
Tisha B'av - black

But I seem to be missing one.


Theirs: Tasnis Bechoros on Erev Pesach
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ChanieMommy




 
 
    
 

Post Tue, Sep 22 2020, 9:02 pm
malki2 wrote:
Hooray Hooray Hooray


but those are not things... they are units in time...
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malki2




 
 
    
 

Post Wed, Sep 23 2020, 12:35 am
ChanieMommy wrote:
but those are not things... they are units in time...


Define time. (That’s my riddle for the night.)
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ExtraCredit




 
 
    
 

Post Wed, Sep 23 2020, 1:20 am
ChanieMommy wrote:
That might look a bit complicated, but it is kind of similar to the russian roulette with remixing...

Hidden: 

For the russian roulette, we had 5/6 chances of survival at the first try, 5/6 * 5/6 for the second try,
5/6 * 5/6 * 5/6 for the third, etc...

Now for the birthday, we have 365/365 chances of not having the same birthday as anyone else for the first person (because there is only one person, only one birthday, no sharing).

The second person has a chance of 364/365 * 1 of not having the same birthday, since this person could pick from the 364 remaining days so as not to have the same birthday.

the third person has a chance of 363/365 of not having the same birthday as either of them, and together they have a chance of 363/365* 364/365* 365/365 that no-one shares birthdays.

So the 23rd person has a chance of 342/365 of not sharing a birthday with any of the other ones, and together they have a chance of 365*364*363*....* 343/36523 that no-one shares birthdays...
And if you calculate that, you get 49%, which means that the have a little over 50% chance to share a birthday...

If this was not clear enough, here is a youtube video...





I spaced out after 20 seconds but thanks anyway Hiding

I’m afraid my brain is too sunny side upped at this point.
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ExtraCredit




 
 
    
 

Post Wed, Sep 23 2020, 1:21 am
malki2 wrote:
Hooray Hooray Hooray


Good one!
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ChanieMommy




 
 
    
 

Post Wed, Sep 23 2020, 2:05 am
malki2 wrote:
Define time. (That’s my riddle for the night.)

Time is not a thing, that's for sure...
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ChanieMommy




 
 
    
 

Post Wed, Sep 23 2020, 2:08 am
ExtraCredit wrote:
I spaced out after 20 seconds but thanks anyway Hiding

I’m afraid my brain is too sunny side upped at this point.


But I thought you loved maths?

Here is a shorter simpler one:

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ExtraCredit




 
 
    
 

Post Wed, Sep 23 2020, 2:45 am
ChanieMommy wrote:
But I thought you loved maths?

Here is a shorter simpler one:


Ahhhhhhhhh. Now I got it. All you gotta do is say it with food and it will break through all sunny fried up barriers.
Yes I love love love math but when the mind is on overload it can’t concentrate as well as it did several decades ago Surprised
Keep em coming though.
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ChanieMommy




 
 
    
 

Post Wed, Sep 23 2020, 2:55 am
ExtraCredit wrote:
Ahhhhhhhhh. Now I got it. All you gotta do is say it with food and it will break through all sunny fried up barriers.
Yes I love love love math but when the mind is on overload it can’t concentrate as well as it did several decades ago Surprised
Keep em coming though.


Still in Backgammon (sheshbesh)

You throw two dice.
You can count either the sum of the points on both dice, or each die separately:

What is the least probable number you can throw with two dice?

What is the most probable number you can throw with two dice?
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