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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.

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Telephone demonstration

In 1877, a news dispatch was sent using Alexander Graham Bell's new invention, the telephone, for the first time in the U.S. It was sent from Salem, Mass. to the Boston Globe in Boston, Mass., a distance of sixteen miles.

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