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A couple went for a picnic. ...

A couple went for a picnic. They have 5 sons and each son has 7 sisters and each sister has 3 babies. In total, how many people went for the picnic?

Correct answers: 186

The first user who solved this task is Sanja Šabović.

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Two old married men chatting i...

Two old married men chatting in a bar.
First man says, "Have you ever thought that marriage was a bit of a lottery?"
The second man replied, "Not at all. At least you have a slight chance with a lottery."

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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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