How many squares on a chessboard?
[25] How many squares on a chessboard? - How many squares on a chessboard? - #brainteasers #math #riddles - Correct Answers: 98 - The first user who solved this task is Sanja Šabović
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How many squares on a chessboard?

How many squares on a chessboard?
Correct answers: 98
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
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Belated Guardian Angel

Walking down the street, a man hears a voice: Stop! If you take one more step, a brick will fall down and kill you.
The man stopped; a big brick fell in front of him. The astonished man continued walking to the cross walk.
The voice shouted, Stop! If you take one more step, a car will run over you and you will die.
The man stood still; a car came careening around the corner, barely missing him.
Where are you? the man asked. Who are you?
I am your guardian angel, the voice answered.
Oh yeah? the man asked. Where the hell were you when I got married last week?
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Pafnuty Lvovich Chebyshev

Born 16 May 1821; died 8 Dec 1894 at age 73. Russian mathematician who founded the St. Petersburg mathematical school (sometimes called the Chebyshev school), who is remembered primarily for his work on the theory of prime numbers, including the determination of the number of primes not exceeding a given number. He wrote about many subjects, including the theory of congruences in 1849, probability theory, quadratic forms, orthogonal functions, the theory of integrals, the construction of maps, and the calculation of geometric volumes. Chebyshev was also interested in mechanics and studied the problems involved in converting rotary motion into rectilinear motion by mechanical coupling. The Chebyshev parallel motion is three linked bars approximating rectilinear motion.[Old style dates: Born 4 May 1821; died 26 Nov 1894]
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