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Solution

✅ Correct Option: 4

The outer numbers follow the rule: multiply by the central number 5 and add 1.

3×5+1=163\times5+1=16, 16×5+1=8116\times5+1=81, 81×5+1=40681\times5+1=406, so the next term is 406×5+1=2031406\times5+1=2031.

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