A password consists of three letters followed by a two-digit number. (a) How many passwords are...

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Answer 1

Answer #1

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3 letters followed by 2 digit number:

a. If there are no restrictions then the number of possible combinations is :

26*26*26 *10*10

as there are 26 digits in total, and 10 numbers in total

= 1757600

b. P(guessing password in 1 trial if there are no restrictions)
= 1/1757600

= 0.0000005690

Answer is B.

Answer 2

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