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A combination lock has four wheels in a row. Each wheel has the digits from 0 to 9 on it. How many different combinations are there? (b)How many different combinations are there if we can only use each
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A combination lock has four wheels in a row. Each wheel has the digits from 0 to 9 on it. How many different combinations are there?

(b)How many different combinations are there if we can only use each digit once?

User Thomas Schneiter
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1 Answer

4 votes

Answer:

Explanation:

a.10^4=10000

b.10×9×8×7=5040

User KevinIsNowOnline
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