Questions tagged [logical-deduction]
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).
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I need a schedule! 12 teams, 5 events. Details [closed]
I need a schedule with 12 teams, and 5 different events.
There are 12 rounds, so 2 teams will have a bye each round (each team will have a total of two byes).
Each team plays each event twice. Each ...
15
votes
1
answer
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Tombs of Ancients
This is part 68 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Dear Puzzling,
The top grid here is a Yin-yang puzzle. Shade some cells in the grid so that ...
- 78.5k
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Next date in the future such that all 8 digits of MM/DD/YYYY are all different and the product of MM, DD and YY is equal to YYYY
This problem is a little variation from this problem I made 2 months ago, which is inspired from this post.
When is the next date in the future such that all 8 digits of MM/DD/YYYY are all different ...
- 265
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How to match pairs on raw tables?
The idea for the puzzle came from working with test score tables. In this case, the raw tables indicate an internal identifier that differs from user_id. To match, you have to download solutions and ...
- 1,701
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Find the value of '?' in 4x4 table of numbers [closed]
Solve for ?
50
15
10
60
45
31
5
87
40
22
42
?
9
4
3
14
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What s the solution to the third pattern? [closed]
The values of the following two items are solved and you have to solve the third one according to the logics
27=SDD 91=QBI 43 =?
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What should the next step be in this Kakuro puzzle?
I have recently been learning more and more tricks for solving Kakuro puzzles, but I'm at a loss for how to solve the final bit of this puzzle. For reference, it is from the "Real Kakuro" ...
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Bulls and Cows meet Sudoku!
This is a Colombian Jigsaw Sudoku where the usual rules apply, but with irregular boxes. The dots in the right-hand scheme indicate how many of the numbers in a particular row or column are correctly ...
- 479
2
votes
2
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Finding a mystery number - with three logicians
Three perfect logicians named A, B and C each select a positive integer and report their number to Mufti.
Mufti writes the sum of the three numbers on one card and the product of the three numbers on ...
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votes
2
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Lewis Carroll's Logic Problem: what do you know about great-grandsons?
This is from "Symbolic Logic, part 1 and part 2", by Lewis Carroll, edited by W.W. Bartley (1977), page 362:
A man can always master his father;
An inferior of a man's uncle owes that man ...
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Finding a mystery number from a sum and product, with a twist
At a party of perfect logicians, Alzim and Era each select a positive integer and and report the number to Mufti.
Mufti writes the sum of the two numbers on a card and the product on another card. ...
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Prove that all 101 balls have the same weight
In a collection of 101 balls, each ball weighs a whole number of pounds. If any one is removed from the collection, the remaining balls can be divided into two groups of 50 balls each with the total ...
- 3,183
3
votes
1
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Generalized knights and knaves puzzle
A basic knight-knave puzzle (for the purposes of this question) takes the form $Q(n, s, k, x)$, where:
$n$ men are guarding $n$ doors. The guards and doors are numbered for easy reference: Guard #1 ...
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Going around in circles
Solve the grid. Then solve the grid again.
The answer can be one or two letters long.
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Nonconsecutive Anti-Knight Fillomino?
Rules of Fillomino:
Fill in all empty cells with numbers under the following rules.
Divide all of the board into blocks.
Fill each block with the same number horizontally or vertically.
Each block ...
- 15.8k