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Correct

Explanation

An r! PA_R_IS

Solve this puzzle

There are 100 pairs of dogs. 2 pairs are born for every dog. 23 dogs did not survived. How many dogs are left?

977 1 200 100

Prehistoric Mathematics

Here is our first article devoted to the history of mathematics. The article contains the analysis of the development of the numeral system in the prehistoric era and four main stages of the “number” concept evolution.

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