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За новогодним круглым столом N мест. Вчера на каждом месте сидел один человек. Сегодня на каждом месте лежит один из тех же N человек, но ни один не лежит на том же самом месте, и не лежит на месте, которое было соседним с тем, которое он занимал вчера. Сколькими способами это можно было сделать?

(Олимпиада школьников по математике)

#задача #олимпиадная_задача #математика



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За новогодним круглым столом N мест. Вчера на каждом месте сидел один человек. Сегодня на каждом месте лежит один из тех же N человек, но ни один не лежит на том же самом месте, и не лежит на месте, которое было соседним с тем, которое он занимал вчера. Сколькими способами это можно было сделать?

(Олимпиада школьников по математике)

#задача #олимпиадная_задача #математика

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"And that set off kind of a battle royale for control of the platform that Durov eventually lost," said Nathalie Maréchal of the Washington advocacy group Ranking Digital Rights. You may recall that, back when Facebook started changing WhatsApp’s terms of service, a number of news outlets reported on, and even recommended, switching to Telegram. Pavel Durov even said that users should delete WhatsApp “unless you are cool with all of your photos and messages becoming public one day.” But Telegram can’t be described as a more-secure version of WhatsApp. The account, "War on Fakes," was created on February 24, the same day Russian President Vladimir Putin announced a "special military operation" and troops began invading Ukraine. The page is rife with disinformation, according to The Atlantic Council's Digital Forensic Research Lab, which studies digital extremism and published a report examining the channel. Since January 2022, the SC has received a total of 47 complaints and enquiries on illegal investment schemes promoted through Telegram. These fraudulent schemes offer non-existent investment opportunities, promising very attractive and risk-free returns within a short span of time. They commonly offer unrealistic returns of as high as 1,000% within 24 hours or even within a few hours. In the United States, Telegram's lower public profile has helped it mostly avoid high level scrutiny from Congress, but it has not gone unnoticed.
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