18. A password consists of 3 lower case letters, followed by 3 digits. Determine how many different passwords are possible if a) Repetition of letters and digits IS permitted b) Repetition of letters and digits is NOT permitted. c) Repetition of letters and digits IS NOT permitted, the first letter is (a, b, c, d) and the first digit is odd.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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18. A password consists of 3 lower case letters, followed by 3 digits. Determine how many different
passwords are possible if
a) Repetition of letters and digits IS permitted
b) Repetition of letters and digits is NOT permitted.
c) Repetition of letters and digits IS NOT permitted, the first letter is (a, b, c, d) and the first digit is odd.
Transcribed Image Text:18. A password consists of 3 lower case letters, followed by 3 digits. Determine how many different passwords are possible if a) Repetition of letters and digits IS permitted b) Repetition of letters and digits is NOT permitted. c) Repetition of letters and digits IS NOT permitted, the first letter is (a, b, c, d) and the first digit is odd.
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