Exam Style question:
Jess has a 4-digit password for her mobile phone. Each digit can be between 0 and 9 inclusive.
a) How many choices are possible for each digit of the code?
b) What is the total number of 4-digit passwords that Jess can create?
Jess would like to choose an even number. The code can start with zero.
c) How many different ways are possible now?