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Calculate AxB

Determine the pattern of the subtraction, and calculate AxB.

Correct answers: 27

The first user who solved this task is Sanja Šabović.

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Strangers In The Night

A married couple is sleeping when the phone rings at 3 a.m. The wife picks up the phone and, after a few seconds, replies,"How am I supposed to know? We're 200 miles inland!"and hangs up.
Her husband rolls over and asks,"Sweetheart, who was that?"

"I don't know,some dumb bitch asking if the coast is clear."

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Black-American patent

In 1834, Henry Blair of Glenross, Maryland, received a U.S. patent on a corn planter (No. X8447). Two years later, on 31 Aug 1836, he was also issued a patent on a cotton seed planter (No. 15). Blair was born in Maryland about 1807 and lived until 1860. He was a successful farmer whose inventions met a need to increase efficiency in farming. His patents were signed with a simple "X" because he had not learned to read or write. Henry Blair was the second African-American to hold a patent. For some time he had been regarded as the first, until it became better known that the first African-American on record to be granted a patent was Thomas Jennings for a "dry-scouring" cleaning process (3 Mar 1821, No. X3306).«[Image top: side view of machine; bottom: detail of section of seed hopper showing cylinder with holes in the periphery that turns with the wheels to drop grains of corn.]

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