ScholarMatic: Explanation & Answer
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Probability
8. You just
bought a new safe: It has a key pad with 26 letters on it. The code is 4 random
letters
a. How many
different codes are there for you to select from if no letter can be used more
than once?
b. If no
letter can be used more than once. Does Order Matter?
c. If the
manufacturer decided to reduce the code from 4 to 3 (no repeats) how many codes
are there then?
d. If
letters can be used multiple times (4 inputs), how many different codes are
available?
e. If
letters can be used multiple times (4 inputs), and the first letter must be an
“A” how many different codes are available?
ScholarMatic: Explanation & Answer
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