MATH PUZZLE: Can you replace...
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 284
The first user who solved this task is Erkain Mahajanian.
#brainteasers #math #riddles
First telephone exchangeIn 1878, the first commercial telephone exchange in the U.S. was installed at New Haven, Connecticut, and served 21 subscribers connected by a single strand of iron wire. For the first six weeks, the exchange was not operated at night. Instead of "hello," the first experimental shout was "Ahoy, ahoy." The first operator was George W. Coy. A Bell franchise had been awarded for New Haven and Middlesex Counties to Coy on 3 Nov 1877, paid for by incorporating as a company with two financial partners. Coy improvised his first crude switchboard, using carriage bolts, handles from teapot lids and bustle wire. The concept of interconnecting phone wires had been tried before by three other men, but none of these men attempted commercial telephone operations. |