Question: Part 2: A suitcase has a combination lock with four wheels. Each wheel has ten digits, 0 through 9 How many different combinations are there?

Part 2: A suitcase has a combination lock with four wheels. Each wheel has ten digits, 0 through 9 How many different combinations are there? Assume that a thief can try one combination every second, and that the thief will get lucky after trying about half the combinations, how long will it take the thief to open the briefcase?

If each wheel of the briefcase lock has only eight digits: 0, 1, 2, 3, 4, 5, 6, 7; how many different combinations are there? How long will it take our thief to open the lock?

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