4. (a) A particular voicemail system allows numerical passwords of length 3, 4, or 5 digits. How many passwords are possible in this system? (b) What about numerical passwords of length 4, 5 or 6?
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So, the total number of possible passwords is: $10 \times 10 \times 10 = 10^3 = 1000$ Show more…
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EMAIL
PASSWORD