According to the Sefton Council Password Policy (August 2007), the United Kingdom government recommends the use of “Environ passwords with the following format: consonant, vowel, consonant, consonant, vowel, consonant, number, number (for example, pinray45).”
(a) Assuming passwords are not case sensitive, how many such passwords are possible (assume that there are 5 vowels and 21 consonants)?
(b) How many passwords are possible if they are case sensitive?