Find number abc
[7499] Find number abc - If 80a33 - 77bb1 = aaca find number abc. Multiple solutions may exist. - #brainteasers #math - Correct Answers: 3
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Find number abc

If 80a33 - 77bb1 = aaca find number abc. Multiple solutions may exist.
Correct answers: 3
#brainteasers #math
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The perfume

The young man says to his date, "I really like the perfume you're wearing. What's it called?"

The young lady looks puzzled for a minute then searches through her purse, finally dumping the contents on the table between them. She searches through the pile and finally finds a small spray bottle.

She examines the label and announces, "Here it is... 'Unforgettable'."

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Three element vacuum tube

In 1907, the three-element vacuum tube was issued a U.S. patent to its inventor, Dr Lee de Forest as a “device for amplifying feeble electric currents - such, for example, as telephone currents” (No. 841,387). The tube was evacuated, with some remaining conducting gas molecules, and it was suggested using for the heated electrode such material as platinum, tantalum or carbon. He had made a public annoucement of his device a few months earlier, on 20 Oct 1906 at a meeting of the American Institute of Electrical Engineers held in New York City. On 18 Feb 1908, he received another patent for the grid electrode tube (No. 879,532).
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