What number comes next?
[249] What number comes next? - Look at the series (2, 3, 6, 21, 231), determine the pattern, and find the value of the next number! - #brainteasers #math - Correct Answers: 56 - The first user who solved this task is Slobodan Strelac
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What number comes next?

Look at the series (2, 3, 6, 21, 231), determine the pattern, and find the value of the next number!
Correct answers: 56
The first user who solved this task is Slobodan Strelac.
#brainteasers #math
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Complicated order

A resident in a seaside hotel breakfast room called the head waiter to his table. "I want two boiled eggs, one of them so undercooked it's runny, and the other so overcooked, it's tough and hard to eat. Also, give me some grilled bacon that has been left on the plate to get cold; burnt toast that crumbles away as soon as you touch it with a knife; butter straight from the deep freeze so that it's impossible to spread; and a pot of very weak coffee, luke-warm."

"That's a complicated order, Sir," said the bewildered waiter. "It might be quite difficult to prepare."

The guest replied, "Oh? But that's what I got yesterday!!"

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Peter Dollond

Died 2 Jul 1820 (born 1730).British optician, son of John Dollond. Peter, though lacking a theoretical background, invented the triple achromatic lens still in wide use, made substantial improvements in the astronomical refracting telescope, and improved navigation instruments of his day. In 1765, he placed convex lenses of crown glass on either side of a biconcave flint glass lens to make the achromatic triplet lens to further improve the correction of colour fringes. (In 1733, Chester Moore Hall had invented the achromatic lens system by joining a crown glass lens and a flint glass lens, which reduce chromatic aberration.)
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