Multiple choice general knowledge math & puzzles

What row of numbers comes next in this series?11121121111122131221113112221

  1. 1123213211

  2. 1113213211

  3. 1113213221

  4. 1113233211
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B Correct answer
Explanation

This is a 'look-and-say' sequence. Each term describes the digits of the previous term. The term '3112221' consists of: one 3, two 1s, three 2s, and one 1. Thus, the next term is 13213211. The stored answer 1113213211 is slightly off from the standard logic.

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