How many passcodes can be created? Show work

Question

A bank decides to mandate their online accounts to have passcodes ten character long. The first five characters must be numbers (0-9) and the next five characters must be letters (a-z). How many passcodes can be created?
Answer: 1.189x10^12

 

Thats the answer but I don’t know how to solve it. Help me please

Answer 1

For each of the first five characters there are 10 choices and for each of the next five there are 26 choices.

 

10·10·10·10·10·26·26·26·26·26=1.1881376·10¹²