Answer :

the pattern goes thus,

11

21

1211

111221

312211

13112221

1113213211

so the pattern that comes next is

1113213211

each successive number is formed by looking at the preceding number and reading out the digits, grouping like digits together and saying the number of identical digits followed by the digit

so,

1 1 is read as one one

the next is two one that's 21

then the next is one two one one thats 1211

then the next is one one one two two one thats 111221

then the next is three one two two one one that's 312211

then the next is one three one one two two two one that's 13112221

then the next is one one one three two one three two one one which is 1113213211 and its the final pattern

what you do is that you write down the way you pronounce it in the next term.

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