Question

A password must consist of exactly 5 letters. Julie decides to use every vowel (A,E,I,O, and U) in her password. How many different passwords can Julie make?

Answer 1

a lot.

Answer 2

5 letters, aeiou

for the first letter, she can choose any one of the five vowels
for the second letter, she already used up one of the vowels, so she only has 4 left
third letter: she only has 3 choices
fourth letter: she only has 2 choices
fifth letter; she only has one choice

5*4*3*2*1 = ?