Number Pattern: 121 --> 111211 --> 311221

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SUMMARY

The discussion centers on the Look-and-say sequence, specifically the transformation of the number 121 into 211213. The sequence describes how to read the digits of a number, where 121 is interpreted as "one one, one two, one one," leading to the next term, 211213, which is read as "two ones, one two, one one." Participants express confusion and seek clarification on the sequence, which is often encountered in IQ tests or job applications, particularly in tech companies like Google.

PREREQUISITES
  • Understanding of the Look-and-say sequence
  • Basic number theory concepts
  • Familiarity with pattern recognition techniques
  • Problem-solving skills applicable to IQ tests
NEXT STEPS
  • Research the mathematical properties of the Look-and-say sequence
  • Explore applications of the Look-and-say sequence in algorithm design
  • Learn about similar pattern recognition problems in coding interviews
  • Study the history and variations of the Look-and-say sequence
USEFUL FOR

Mathematicians, software engineers, and individuals preparing for technical interviews who are interested in number sequences and pattern recognition challenges.

lahirurana
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upload_2018-10-29_16-56-19.jpeg

Do anyone have any clue how to get the answer??
 

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121 → One one, one two, one one → Three ones, one two, two ones.
 
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WHere are these IQ test problems coming from? or are you applying for a job at Google?
 
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mjc123 said:
121 → One one, one two, one one → Three ones, one two, two ones.
Can please explain? I didn’t got it.
 
jedishrfu said:
WHere are these IQ test problems coming from? or are you applying for a job at Google?
Lol nope. Not in google :)
 
lahirurana said:
Can please explain? I didn’t got it.
I think i got it after staring at your answer for few minutes :) Answer is 211213? Isn’t it?
 
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lahirurana said:
I think i got it after staring at your answer for few minutes :) Answer is 211213? Isn’t it?
Yes.
 
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