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Calculate the number 252

NUMBERMANIA: Calculate the number 252 using numbers [6, 6, 8, 7, 88, 990] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 29

The first user who solved this task is Sanja Šabović.

#brainteasers #math #numbermania

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Permanent wave

In 1906, a German, Karl Ludwig Nessler, demonstrated the first “permanent wave” for hair, in his beauty salon in Oxford Street, London, to an invited audience of hair stylists. The hair was soaked with an alkaline solution and rolled on metal rods which were then heated strongly. However, this method had the disadvantages of being very lengthy (about 5 hours) and expensive for each application. Also the machine was large and cumbersome, and the client was obliged to wear a dozen brass curlers, each weighing 1-3/4 lb. With the outbreak of WW I, he moved to the United States and opened salons in New York, Chicago, Detroit, Palm Beach and Philadelphia with a peak of 500 employees.

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