How many possible code combinations are there for this kind of lock?
999
1000
9999
10000
The possible codes are from 0000 to 9999 inclusive. There are 10 possibilities for each ring, thus there are 10*10*10*10 possible codes.
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999
1000
9999
10000
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23

18

151

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11

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168

12261

105

15

10

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21

75

11