Joke Collection Website - Public benefit messages - The company's engineering department *** has 20 employees. How many minutes can it take to notify each employee?
The company's engineering department *** has 20 employees. How many minutes can it take to notify each employee?
At least 5 minutes.
1 minute----1 person
2 minutes----3 people
3 minutes----7 people
< p>4 minutes----15 people5 minutes----31 people
Every time he notified an employee, he asked the employee to also notify other people, and asked others People also notify the next group. As shown above, after 1 minute, A (1 person) was notified, and after 2 minutes, A notified B, and at the same time, C was notified, so after 2 minutes, 3 people, A, B, and C, were actually notified. And so on. Only 15 people were notified after 4 minutes, so it will take at least 5 minutes.
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