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Its the look and say sequence .. (The n th term describes the n − 1 th term)
→ one 1 (11) (second term descriing the first term)
→ two 1 (21) (third term describing the second term) and so on . So, we can find the answer just by the last term
thus13112221 → one1 one3 two1 three2 one1 → 1 1 1 3 2 1 3 2 1 1 ----(ans)