You have to form a 7 letter password using 10 digits and 26 letters. Only lower case letters as allowed. For example, 01x01xb, 11bcaa0, etc. are valid passwords.
- How many passwords can you make with 26 letters and 10 digits?
- How many passwords have atleast one alphabet and atleast one digit?
- How many passwords are there with at least one consonant and atleast one vowel and atleast one digit? Note that there are 5 vowels and 21 consonants.
- Suppose there are 12 additional special characters. How many passwords are there with atleast one vowel, one consonant, one digit and one special character?
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