3. Students are required to create 5 or 6character long passwords to access the library. The letters must be from lowercase letters or digits. Each password must contain at most two lowercaseletters and contains no repeated digits. How many valid passwords are there? You are required to show your work stepbystep [9 marks] Note:As an example, password '1hf21' is invalid because 1 appears more than once. Password '34g5g1'is valid because there are 2 lowercase letters, and no digits is repeated