Bud Gordon
1. You need to find the underlying rule that unites all numbers in each set but one.
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2. For this specific puzzle, think about sequences.
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3. How does each new number relate to what comes before it?
(PARTIAL SOLUTION FOLLOWS)
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4. In the first set, each number increases by 3, except for one.
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5. In the second set, the difference of the numbers increases by 1 each time, with one exception.
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6. In the third set, each number is the sum of the previous two, with one exception.
(SOLUTION FOLLOWS)
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7. Select 14, 15 and 39, then turn the dial.