The number 179 should be in place of the question mark. If you move clockwise starting from 3, then each subsequent number is equal to twice the previous one, to which you added 1, 3, 5, 7, 9. p>
3 × 2 + 1 = 7.
7 × 2 + 3 = 17.
17 × 2 + 5 = 39.
39 × 2 + 7 = 85.
85 × 2 + 9 = 179.
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