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What number comes next: 1, 11, 21, 1211, 111221, 312211, 13112221?

Question 1:

What number comes next: 1, 11, 21, 1211, 111221, 312211, 13112221?

A. 131122211211

B. 11221311

C. 31221113112221

D. 1113213211

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Trivial Practice Quiz brain-teasers - Test 1 | Englishfreetest.com

30 minutes
15 questions