BRAIN TEASERS

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Which is a winning combination of digits?

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: 50

The first user who solved this task is On On Lunarbasil.

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My mind is gone

"Oh God," sighed the wife one morning, "I'm convinced my mind is almost completely gone!"

Her husband looked up from the newspaper and commented, "I'm not surprised: You've been giving me a piece of it every day for twenty years!"

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Benjamin Banneker

Born 9 Nov 1731; died 9 Oct 1806 at age 74. Black-American astronomer, inventor and mathematician, compiler of almanacs and one of the first important black American intellectuals who was the self-educated son of a freed slave. He was the first to record the arrival of the "seventeen-year locusts" or periodical cicadas. In 1753, Banneker built a wooden clock that kept accurate time even though he had only previously seen a sundial and a pocket watch. He calculated the clock's gear ratios and carved them with a pocket knife. In 1789, he successfully predicted an eclipse. He helped survey the site of Washington D.C. (1791-3). Banneker was also an early antislavery publicist who worked to improve the lot of black people in the U.S.«[Note: some sources give date of death as 25 Oct 1806]

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