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Math and logic riddle thread
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 9:12 pm
ExtraCredit wrote:
Hidden: 

No, you do 14 then 1-12 is enough. If still didn’t break by 12 you know it’s 13. So that’s 13 attempts!


Um, no. If it crashed by 14, you still won't know if 13 or 14 is the breaking point.....
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  tothepoint  




 
 
    
 

Post Tue, Oct 20 2020, 9:12 pm
No but what if it’s the 14th floor?
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 9:12 pm
tothepoint wrote:
No but what if it’s the 14th floor?

JINX
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:13 pm
Oh got it! Forgot this point! So is it 14 pretty please?
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  tothepoint  




 
 
    
 

Post Tue, Oct 20 2020, 9:13 pm
Tamari wrote:
JINX


Hi
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:14 pm
I celebrated on 13 scoops of ice cream before. If it’s 14 I’ll go take 1 more.
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 9:14 pm
ExtraCredit wrote:
Oh got it! Forgot this point! So is it 14 pretty please?

Yes. I hope you had your ice cream....with sprinkles too....
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:16 pm
Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream
Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 9:16 pm
ExtraCredit wrote:
Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream Ice cream
Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn Yawn


I had to double-count, but ye you got the number right LOL
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:18 pm
Tamari wrote:
I had to double-count, but ye you got the number right LOL

14 yawns too.
Great riddle. It adds up. Laugh
Good night!
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  ChanieMommy  




 
 
    
 

Post Wed, Oct 21 2020, 12:32 am
tothepoint wrote:
No but what if it’s the 14th floor?

If it crashed by 13, it's 13, if it didn't, it's 14...

So the solution is
Hidden: 

you try on floors 14, 27, 39, 50, 60, 69, 77, 84, 90, 95 with your first bulb,till it breaks, and this way you will need 14 tries maximum?


Last edited by ChanieMommy on Wed, Oct 21 2020, 8:27 am; edited 1 time in total
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  tothepoint  




 
 
    
 

Post Wed, Oct 21 2020, 6:20 am
ExtraCredit wrote:
Hidden: 

Breathe?


No... I can choose to hold my breath now
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  tothepoint  




 
 
    
 

Post Wed, Oct 21 2020, 6:21 am
ChanieMommy wrote:
Hidden: 

Exist?
Be subject to gravity?
Grow hair?
Grow nails?
Create new cells?/divide cells?
Breathe?
Let their heart beat?


None of them are the answer I’m looking for.. more of a general term for your 2nd & 3rd reply
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  LiLIsraeli




 
 
    
 

Post Wed, Oct 21 2020, 7:53 am
tothepoint wrote:
Let’s start with 14. If it breaks at 14 you still need to try 1-13. (The logic of leaving out the last only works for the 100th floor)


I'm confused. How are you trying all these if you only have two bulbs?
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  ChanieMommy  




 
 
    
 

Post Wed, Oct 21 2020, 8:22 am
LiLIsraeli wrote:
I'm confused. How are you trying all these if you only have two bulbs?


I can break my first bulb.

Hidden: 

But with my second bulb I have to go from the lowest floor (or from the lowest floor where I am sure it will not break) one by one, throw it down, check if it breaks...

If it breaks, the floor underneath is the highest floor I can throw the bulb down from without breaking it.

If it does not break, I try the next floor...

So if I throw my first bulb from floor 50, and floor 49 happens to be the highest floor from which I can throw my bulb without breaking it, I will have to try floor 1 with my second bulb, then floor 2, then floor 3, all the way to 49...

So it took me one test with the first bulb and 49 with the second bulb, a total of 50 tests...

But we want to minimize the number of tests necessary to find out which is the critical floor from which it breaks, no matter which floor it is...

So if we one by one, bottom to top from the start, we don't really use the potential of the second bulb, and we will need to do 99 tests in the worst case (if it breaks only at 100)

If we jum straight to 50, we might need 50 tests...

So the ideal is somewhere between 1 and 50, or between 2 and 40 or between 10 and 20...
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  ChanieMommy  




 
 
    
 

Post Wed, Oct 21 2020, 8:25 am
tothepoint wrote:
None of them are the answer I’m looking for.. more of a general term for your 2nd & 3rd reply


Oh, I see
Hidden: 


live?
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  tothepoint  




 
 
    
 

Post Wed, Oct 21 2020, 8:31 am
ChanieMommy wrote:
Oh, I see
Hidden: 


live?


No..
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  tothepoint  




 
 
    
 

Post Wed, Oct 21 2020, 9:33 am
Three prime numbers add up to 100. Of the three numbers, one of them is more than a third but less than a half of another. Find the three numbers.
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  ExtraCredit  




 
 
    
 

Post Wed, Oct 21 2020, 10:34 am
tothepoint wrote:
Can you name the one thing that all people on earth do simultaneously?

Hidden: 

Rotate on the axis? Nervous
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  tothepoint  




 
 
    
 

Post Wed, Oct 21 2020, 10:35 am
tothepoint wrote:
Can you name the one thing that all people on earth do simultaneously?


Hidden: 

Grow older!
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