1. numbers arranged in a specific order factorial 2. an array of numbers 0! 3. a symbol for a sum Sigma 4. a series whose terms are formed by addition series 5. 1 combinations 6. a series whose terms are formed by multiplication geometric series 7. symbol is ! permutation 8. a set of elements that does not consider order sequence 9. a study of likelihoods Pascal's triangle 10. a sum of numbers in a specific order probability 11. a set of elements in a specific order arithmetic series