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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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The Russian invasion of Ukraine has been a driving force in markets for the past few weeks. "Your messages about the movement of the enemy through the official chatbot … bring new trophies every day," the government agency tweeted. "Markets were cheering this economic recovery and return to strong economic growth, but the cheers will turn to tears if the inflation outbreak pushes businesses and consumers to the brink of recession," he added. Markets continued to grapple with the economic and corporate earnings implications relating to the Russia-Ukraine conflict. “We have a ton of uncertainty right now,” said Stephanie Link, chief investment strategist and portfolio manager at Hightower Advisors. “We’re dealing with a war, we’re dealing with inflation. We don’t know what it means to earnings.” At the start of 2018, the company attempted to launch an Initial Coin Offering (ICO) which would enable it to enable payments (and earn the cash that comes from doing so). The initial signals were promising, especially given Telegram’s user base is already fairly crypto-savvy. It raised an initial tranche of cash – worth more than a billion dollars – to help develop the coin before opening sales to the public. Unfortunately, third-party sales of coins bought in those initial fundraising rounds raised the ire of the SEC, which brought the hammer down on the whole operation. In 2020, officials ordered Telegram to pay a fine of $18.5 million and hand back much of the cash that it had raised.
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