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zakruti.com » Knowledge, science, education » TED-Ed
Can you find the next number in this sequence? - Alex Gendler

Can you find the next number in this sequence? - Alex Gendler

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Rating: 4.0; Vote: 1
1, 11, 21, 1211, 111221. These are the first five elements of a number sequence. Can you figure out what comes next? Alex Gendler reveals the answer and explains how beyond just being a neat puzzle, this type of sequence has practical applications as well. Lesson by Alex Gendler, directed by Artrake Studio
Date: 2020-08-22

Comments and reviews: 2


Am I d only person who thought that it was Fibonacci sequence:
1; 1+1=2; 2+1=3; 1+2+1+1=5; 1+1+1+2+2+1=8;
I was convinced that my next no. wud total to 13 with 1s and 2s in it.
My guess was: 1111221211
Logic was place the earlier no. as it is towards the end and in the later no. push the 2s to the last. Ex: - for 1211 keep 11 and make 21 as 12. Similarly for 111221, keep 21 and make 1211 as 1112.

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First number was 1, second was 11. On the first number there is one 1 so it became eleven, second number had two 1s so it became 21, third number had one 1 and one 1 so it became 1211, fourth number had two 1s, one 2 and one 1 so it became 111221, there is one 1, two 2s, and three 1s so it became 312211
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