Multiple choice general knowledge math & puzzles

Here is a series of numbers. What is the next number in the sequence? 1 11 21 1211 111221 312211 13112221

  1. 1113112211

  2. 1113213211

  3. 1121213211

  4. 1111313211
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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 '13112221' is described as: one 1, one 3, two 1s, three 2s, one 1, resulting in 1113213211.

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