Problem:

You have a box that is locked with a three-digit combination lock, each digit can be 0-9. Every day the combination increases by a specific pattern. If the combination was 123 on Monday and 234 on Tuesday, what will the combination be on Wednesday?

Scroll to the bottom of the page for the answer

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Solution:

The pattern adds 1 to each digit daily (with rollover). Thus, the combination on Wednesday would be 345.