The answer is 312211.
To solve this, you just have to read it. Not like one, eleven, twenty-one, and so on but each number separately.
Like- there is only one 1 at first. So for that, the next number is 11(one 1).
Again, as the second number is two 1s(11), so for that, the next number is 21.
Again, as the third number is one 2 and one 1(21), so for that, the next number is 1211.
Again, as the fourth number is one 1, one 2, two 1s (1211), so for that, the next number is 11 12 21.
Again, as the fifth number is three 1s, two 2s, one 1 (111221), so for that, the next number is 31 22 11.
It's a bit complicated to understand seeing the written answer. But I tried my level best to make it clearly understandable. Hope you understand.
