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What is the following sequence and what is the method to solve it?

Time:08-15

In which step of the sequence below is the number 4 placed?

Sequence

CodePudding user response:

This sequence is called "look-and-say sequence", and according to one of its properties "Digits presence limitation", no digits other than 1, 2 and 3 will appear in the sequence, therefore, it will be no step will be placed by number 4.

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