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Calculate the number 877

NUMBERMANIA: Calculate the number 877 using numbers [7, 1, 2, 1, 15, 866] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 17

The first user who solved this task is Nílton Corrêa de Sousa.

#brainteasers #math #numbermania

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Before the internet ...

What did our parents do to kill boredom before the internet?

I asked my 26 brothers and sisters and they didn't know either

Author:DwightKSchnute

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Julius Lothar Meyer

Born 19 Aug 1830; died 11 Apr 1895 at age 64. (Julius) Lothar Meyer was a German chemist who discovered the Periodic Law, independently of Dmitry Mendeleyev, at about the same time (1869). However, he did not develop the periodic classification of the chemical elements as thoroughly as Mendeleyev. Meyer trained originally in medicine and chemistry. He examined the effect of carbon monoxide on blood. In 1879, Meyer compared atomic volume to atomic weight. Plotted on a graph, the curve showed the periodicity of the elements. He also established the concept of valency by indicating that a given element combined with a characteristic number of hydrogen atoms, and coined the terms like univalent, bivalent, and trivalent, based on that number.«

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