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Results tagged with logical-deduction
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user 375
A puzzle that requires formal logical deduction to arrive at the solution. This suggests more than merely reasoning through clues to find an answer (you might want [situation] for that).
2
votes
10 little dwarves
I'm pretty sure you can save 9 dwarfs.
Dwarf 10 can see 9 hats. He counts the number of white hats and if they are even, says white. If they are odd, he says black. He cannot be saved except by pure …
- 7,855
15
votes
Accepted
Help me find my favourite DVD
You should really consider getting yourself a NAS and a copy of Plex (or other similar software), so that you can stream your movies locally and avoid this problem in the future.
- 7,855
10
votes
Accepted
Cora's Death Logic Puzzle
It was murder.
Assumption 1 (both tell truth = accident) contradicts Beth (if not suicide then murder). Therefore at least one of them wasn't telling the truth, and so (because of assumption 2) it wa …
- 7,855
16
votes
First odd number in a "number dictionary"
Under the belief that Kevin has the correct answer with
8,018,018,885
I decided to look at the bonus. Pulling the prime numbers from http://www.primos.mat.br/, #37 (includes all primes that start wi …
- 7,855
7
votes
The defective clock
I will use the A-G bar notation given in the puzzle. I am also assuming that I only need to find one time that works, based on comments.
Case 1: 4 Broken, A, B, D, G.
James walks in and E is lit. The …
- 7,855
2
votes
Arrange the digits from 0 to 9 into a number which is divisible by every integer from 12 to 21
If I take all the factors of 12-21 and multiply them together, I get
So now all that is left to do is to keep adding it to itself until I get a 10 digit number that satisfies the requirements. The …
- 7,855
21
votes
Accepted
Write digits 1 to 9 in the table, each pointing to next 3x3 grid
It is not possible.
Any solution to this puzzle must also be a solution to the 9x9 Queens puzzle. Luckily, that is a well-known puzzle. It has 352 solutions, but due to symmetry, those 352 solutions c …
- 7,855
1
vote
Checking for cheating in a Sudoku puzzle?
I have a different take in an attempt to slow down cheating:
Include a separate section where nothing qualifies as cheating.
Ideally, it's nearly identical to the "please don't cheat" section, to mini …
- 7,855
5
votes
Accepted
How to get the least possible sum in a closed loop set of squares?
Short way to guess at the answer:
Proving that this works:
Now you asked about strategy:
- 7,855
12
votes
Accepted
A special soccer tournament
I decided that the easiest way to start this problem was
Then I counted up the points for the last 8 teams and
Most importantly,
- 7,855
5
votes
Sudoku.... On your keyboard?
I have an answer. I have not proved uniqueness.
My start is very similar to Ankit's. Put in all the possible numbers. Start reducing at the red squares. However, what really helped was
- 7,855
12
votes
Accepted
How Many Queens to Threaten Themselves?
I found a 10 queen answer. I realized that d'alar'cop's reasoning was slightly off, because threatening is part of the puzzle, so 8 wasn't necessarily a limit. With the 8 inner queens in this position …
- 7,855
6
votes
Five-hand poker
Answer 1, showing his 26 cards:
He has
The secret here is to
Answer 2, showing my 26 cards:
I have
He has
For a difference of
My goal was to frustrate his choices. Give him enough …
- 7,855
15
votes
Accepted
Entangled physicists
Assuming that "kill a random number of kittens" means a random integer from 0 to 20, then there is a 11/21 chance that an even number of kittens have been killed.
The physicians should all agree to g …
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