Calculate axb
[4393] Calculate axb - Look at the series (13, 41, a, 377, b, 3401, ...), determine the pattern, and calculate axb. - #brainteasers #math - Correct Answers: 18 - The first user who solved this task is Manguexa Wagle
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Calculate axb

Look at the series (13, 41, a, 377, b, 3401, ...), determine the pattern, and calculate axb.
Correct answers: 18
The first user who solved this task is Manguexa Wagle.
#brainteasers #math
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A gynecologist who had lost in...

A gynecologist who had lost interest in his medical practice decided to change careers and enrolled in auto mechanic school.
He performed well in the course but was still shocked when he got an off-the-chart 200 on his final exam. He asked the instructor to explain the grade.
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Screw machine

In 1798, the first U.S. patent for a nut and bolt machine was issued to inventor David Wilkinson of Rhode Island. His machine for cutting screw threads incorporated a slide-rest, with a heavy carriage supported on three rollers Afterwards, his machine was operated by water power at Pawtucket Falls, RI. Wilson was a machinist who also produced iron forgings and castings for the cotton industry industry there, such as Slater's Mill. Wilkinson later produced a large general purpose lathe (1806), a pioneering advance that founded the American machine tool industry. [The first machine of importance for trimming the heads of nuts and bolts was invented later by Micah Rugg, who was issued U.S. patent No. 2,766 on 31 Aug 1842.]«
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