Answer:14
Step-by-step explanation:
Answer:
680
Step-by-step explanation:
Use the binomial coefficient where you choose
numbers out of
possible numbers and find the total amount of combinations since order does not matter:

Thus, you can make 680 three-non-repeating-number codes
(x +4) * (x -1)
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Answer:
log = 16
Step-by-step explanation:
The logarithm of x with base b is defined as
logbx=y if and only if by=x
where x>0, b>0, and b≠1.