Consider the word PERMUTE and all the ways you can arrange its letter using each letter only once if the first letter is E. a) One possible permutation is EPRETUM. Write three other possible permutations. b) Use factorial notation to represent the total number permutations possible. Explain why your expression makes sense. Consider the word NUMBERS and all the ways you can arrange its letter using each letter only once. a) One possible permutation is ENBRUMS. Write three other possible permutations. b) Use factorial notation to represent the total number permutations possible. Explain why your expression makes sense.