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Your friend tells you their Instagram password is 4 random lowercase letters followed by a single digit number.
(a) How many different passwords of this format are possible?
(b) How many different passwords end in 7?
(c) How many different passwords do NOT start with "f"?
(d) Your friend tells you their password ends with a 9. What is the probability you guess their password given 100 random guesses?

 Jan 31, 2020
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a 26 x26x26x26x10

b 1/10

c 25x26x26x26x10

d 100/(26x26x26x26)

 Jan 31, 2020

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