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Calculate the number 891

NUMBERMANIA: Calculate the number 891 using numbers [2, 4, 5, 4, 29, 130] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 3

#brainteasers #math #numbermania

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Pull chain bulb socket

In 1896, the first U.S. patent for an electric light bulb socket featuring an on-and-off pull chain was issued to Harvey Hubbell of Bridgeport, Connecticut (No. 565,541). On 8 Nov 1904, he patented a separable electric plug (No. 774250) adapting an Edison screw socket to a flat prong style. His inventions are now familiar throughout North America. His manufacturing company, Harvey Hubbell Inc. still exists today.

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