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Calculate the number 613

NUMBERMANIA: Calculate the number 613 using numbers [2, 8, 9, 4, 39, 538] 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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John Ramsey: Old Security Passwords

So they ask me, Would you like to answer your secret security password question? I think, Oh yeah, surely I can answer a question posed by slightly younger me.

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Stanford Moore

Died 23 Aug 1982 at age 68 (born 4 Sep 1913). American biochemist, who shared (with Christian B. Anfinsen and William H. Stein) the 1972 Nobel Prize for Chemistry for his contribution to the understanding of the connection between chemical structure and catalytic activity of the active centre of ribonuclease molecule, an enzyme. Enzymes are large molecules (macromolecules). The way in which an enzyme accelerates a chemical reaction involves an interaction of the reacting substance (the substrate) with only a limited part of the enzyme molecule, its active site. Moore and Stein have carried out investigations which supplement each other and have led to a complete elucidation of the sequence of amino acids in the enzyme ribonuclease.

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