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What is the missing number i...

What is the missing number in the pattern above?

Correct answers: 290

The first user who solved this task is Rutu Raj.

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The Bear

Two campers where hiking in the forest when all of a sudden a bear jumps out of a bush and starts chasing them.
Both campers start running for their lives when one of them stops and starts to put on his running shoes.
His partner says, "What are you doing? You can't outrun a bear!"
His friend replies, "I don't have to outrun the bear, I only have to outrun you!"

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Joseph Priestley

Born 13 Mar 1733; died 6 Feb 1804 at age 70. English chemist, clergyman and political theorist who discovered the element oxygen. His early scientific interest was electricity, but he is remembered for his later work in chemistry, especially gases. He investigated the “fixed air” (carbon dioxide) found in a layer above the liquid in beer brewery fermentation vats. Although known by different names at the time, he also discovered sulphur dioxide, ammonia, nitrogen oxides, carbon monoxide and silicon fluoride. Priestley is remembered for his invention of a way of making soda-water (1772), the pneumatic trough, and recognising that green plants in light released oxygen. His political opinions and support of the French Revolution, were unpopular. After his home and laboratory were set afire (1791), he sailed for America, arriving at New York on 4 Jun 1794.«

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