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An interesting task

Much controversy and discussion has caused this simple task, and you try to give the correct answer.






Source: znanija.com
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...
Why math
...
Why mathematics describes reality
...
Scientists explain why modern man cannot do without mathematics
...
List of books on mathematics for children
...
Why Israel learn from old Soviet textbooks?
...
A school problem with a catch for those who want to strain the gyrus on a languid winter evening
...
How to teach your baby math: Incredible Doman method
...
The problem of a wise man who bought and sold a cow, for those who want to test their intelligence
...
A clever logic problem that has broken the brain of more than one smart person, try to solve
...
To avoid financial problems, develop logic, gentlemen.
...
The task of the 165-year-old is haunted mathematicians
...
An insidious mathematical example that has two solutions
...
Games Mathematicians
...
Top 10 games of mathematics with our mind and conscience
...
Mathematical warm-up found in an old written notebook in the attic
...
The task that schoolchildren solve playfully, revelling in their wit, adults thoughtfully scratch the back of their head
...
Beauty squared —life in the matrix called "mathematics"
...
What a math teacher does at 51, amassing millions of views
...
Roger Penrose: the picture of the world on a sheet of paper
...
Five children's puzzles, which are introduced into a stupor adults
...
Mathematical problem for which an elderly teacher strokes the head
...
An elementary problem for those who have been friends with mathematics since childhood
...
A savvy task to remember a math teacher with an unevil, quiet word
...
Adults who are not afraid to make mistakes
...
Will you see the example of the most beloved Soviet teacher?
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