BRAIN TEASERS

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Find the right combination

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.

Correct answers: 31

The first user who solved this task is Nílton Corrêa De Sousa.

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Problem Teacher

Math Teacher: "If I have 5 bottles in one hand and 6 in the other hand, what do I have?"
Student: "A serious drinking problem."

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Richard Jordan Gatling

Born 12 Sep 1818; died 26 Feb 1903 at age 84. U.S. inventor, whose Gatling gun (1861) was first successful machine gun, a crank-operated, rapid-fire multibarrel design combining reliability, high firing rate and ease of loading into a single device. His father was also an inventor, and while young, Richard helped him create machines for sowing cotton seeds and thinning cotton plants. In 1839, he designed a screw propeller for steamboats, but found a similar one had been previously patented. From 1844, he continued to invent improved agricultural machines, including one to plant grains, like rice and wheat (adapted from the cotton-sowing machine); a hemp-breaking machine (1850); and a steam plow (1857). The outbreak of the American Civil War spurred him to design firearms (1861).«

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