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90% of people, solving the mathematical problem, make a mistake



Try to do all the calculations quickly and in my mind, do not write and do not use a calculator, and the result will surprise you. Take 1000. 40. Throw Throw a thousand. Add 30. More 1000.
Plus 20. Plus 1000. And plus 10. What happened? * A 5000? Wrong. The correct answer is 4100. If you do not believe me, count on a calculator.

Source: mirfactov.com/
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