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25 * 1 (Posted on 2016-02-18) Difficulty: 2 of 5
There are 25 "ones" arranged in a 5*5 matrix.
You are requested to erase n ones leaving a matrix in which the quantities of "ones" in each column and each row are divisible by 3.

How many distinct solutions are there, provided you do not erase the "one" in the upper left corner?

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
Solutionre(2): solution - what about these? -- back to the computerCharlie2016-02-18 13:50:04
re: solution - what about these?Brian Smith2016-02-18 11:30:30
SolutionsolutionCharlie2016-02-18 10:55:02
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