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Each dog bites once a day, randomly directed at itself, another dog, or the owner. After a week, there are 40 bites on the owner and 3 bites on each dog. How many dogs are in the shelter?

How many Moscow regional license plates (only digits, no letters) contain exactly five sevens, considering regional codes 77, 97, 99, 177, 197, 199, 777?

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Will you need to work outside of regular hours/weekends on this project?

How to calculate the total number of handshakes among 15 people if each shakes hands with each exactly once? You need to name specific numbers and operations, not the final value.

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