New answers tagged calculation-puzzle
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Can you make 39 using the numbers 5 4 3 2 1 in that order?
If allowed to use the factorial operator:
If allowed to use the $\sqrt{x}$ operator:
I couldn't find a way to do it with just + - * / %.
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Can you make 39 using the numbers 5 4 3 2 1 in that order?
Depending on what the meaning of division is:
regular division
or
division rounds down
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General Approach to Solving Cryptarithms
As Gareth's post is close to unbeatable and I think it would be nice to have one authoritative comprehensive answer, this cw is for donations which Gareth may or may not choose to incorporate in his ...
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General Approach to Solving Cryptarithms
Unless you count things like "use a computer to just try all the possibilities", I don't think there's any really systematic approach. But here are some things I do when solving cryptarithms....
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Fill the triangular grid using the digits 1-9 subject to the constraints provided
Gave it a try in "hard mode", where the two knowledge-ish diagonals (MCCCXCVIII and Fahrenheit) are not used in the solving process. It turns out that it is indeed possible to find the ...
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Fill the triangular grid using the digits 1-9 subject to the constraints provided
Solution:
Solving Path
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Are you radical enough to solve this SURDOKU?
Surd-lution (sorry :P):
To start:
Now the step by step:
1:
2:
3:
4:
5:
6:
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Fill the grid subject to product, sum and knight move constraints
You can solve the problem via integer linear programming as follows. For $i,j\in\{1,\dots,5\}$ and $k\in\{1,\dots,20\}$, let binary decision variable $x_{ijk}$ indicate whether cell $(i,j)$ takes ...
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Fill the grid subject to product, sum and knight move constraints
First find a place for 19:
Then for 17:
Then for 18:
For 11, 12, 13:
For 14, 15, 16:
Continuing:
The completed grid:
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Why did the general choose this as the exact time of attack?
I think he wanted to attack at:
If we were to put that time on an analog clock:
I'm not entirely satisfied with this answer, but I feel like I'm on the right trail...
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