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RosePetals

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This is the question from Microsoft; did anyone of you can provide the answer?
Question as below:
1, 11, 21, 1211, 111221, what is next in sequence?
 
This is the question from Microsoft; did anyone of you can provide the answer?
Question as below:
1, 11, 21, 1211, 111221, what is next in sequence?

312211 (three 1's, two 2's, one 1) then 13112221 (one 3, one 1, two 2's, two 1's) then 1113213211
 

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