# Lunch

Seven classmates go every day for lunch. If they always come to the front in a different order, will it be enough school year to take of all the possibilities?

### Correct answer:

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Do you want to convert time units like minutes to seconds?

Would you like to compute the count of combinations?

#### You need to know the following knowledge to solve this word math problem:

**combinatorics**- variations
- permutations
- multiplication principle
**arithmetic**- comparing
**basic functions**- factorial
- reason
**numbers**- natural numbers

#### Units of physical quantities:

#### Grade of the word problem:

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