14. What was fun for the writer?
15. What was the writer worried about?
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Which is easier to write down using an exponent of r: n × n × ... (r times) = nr. Example: in the lock above, there are 10 numbers to choose ... So, our first choice has 16 possibilites, and our next choice has 15 possibilities, then 14, 13, 12, 11, ... etc. And the total permutations are: 16 × 15 × 14 × 13 × ... = 20,922,789,888,000.
Explanation:
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