1
11
21
1211
111221
??????

• It's actually quite simple After starting the sequence with 1, each term in the sequence consists of groups of two numbers based on the previous term - the first being the quantity and the second specifying which digit.
  
  Example: the first term is 1, which has "one 1" in it, therefore 11.
  11 has "two 1's" in it, therefore 21.
  21 has "one 2 and one 1" in it and therefore 1211.
• 9 years agoHelpfull: Yes(18) No(2)
• 1
  11
  111 as 21
  1211
  1112111 as 111221
  11112211 as 312211
  ans 312211
• 9 years agoHelpfull: Yes(11) No(1)
• initially 1 then 11 which is above 1 is described as one 1 it follows like that and ans is 312211 above question mark we have three 1's in it two 2's int and finally one 1.so the answer for above question is .......312211
• 9 years agoHelpfull: Yes(10) No(1)
• 312211
  3 no of1
  2 no of 2
  1 no of 1
• 9 years agoHelpfull: Yes(3) No(0)
• 312211-"3 1's ,2 2's ,1 1's"
• 9 years agoHelpfull: Yes(2) No(0)
• 1
  11
  21
  1211
  111221
  312211
• 9 years agoHelpfull: Yes(1) No(2)
• three ones
  two twos
  one one
  312211
• 8 years agoHelpfull: Yes(1) No(0)
• 13221
  Example: the first term is 1, which has "one 1" in it, therefore 11.
  11 has "two 1's" in it, therefore 21.
  21 has "one 2 and one 1" in it and therefore 1211.
  
• 9 years agoHelpfull: Yes(0) No(1)
• ans : "3 1's" "2 2's" "1 1's" -----> 312211
• 9 years agoHelpfull: Yes(0) No(0)
• the first term is 1, which has "one 1" in it, therefore 11.
  11 has "two 1's" in it, therefore 21.
  21 has "one 2 and one 1" in it and therefore 1211.
  ans: 312211
• 9 years agoHelpfull: Yes(0) No(0)
• there is a series 11211211 row wise
  212111
• 8 years agoHelpfull: Yes(0) No(1)
• 223431, ..
  
• 8 years agoHelpfull: Yes(0) No(1)