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Multiple choice

Find the wrong number in the given series? 1, 3, 9, 31, 129, 652, 3913

  1. 652

  2. 3913

  3. 9

  4. 129

  5. 31
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pattern: ×1+2, ×2+3, ×3+4, ×4+5, ×5+6, ×6+7. Verify: 1×1+2=3, 3×2+3=9, 9×3+4=31, 31×4+5=129, 129×5+6=651, 651×6+7=3913. The given 652 should be 651.

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