# 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:

Tips for related online calculators

See also our permutations calculator.

See also our variations calculator.

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

Would you like to compute the count of combinations?

See also our variations calculator.

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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