Q. What is the next number of the following sequence
1,11,21,1211,111221,.......

• 1 is read off as "one 1" or 11.
  11 is read off as "two 1s" or 21.
  21 is read off as "one 2, then one 1" or 1211.
  1211 is read off as "one 1, then one 2, then two 1s" or 111221.
  111221 is read off as "three 1s, then two 2s, then one 1" or 312211
• 11 years agoHelpfull: Yes(120) No(0)
• ans-312211
  explain:in prevues term 3 times 1,2 times 2 ,1 times 1
• 11 years agoHelpfull: Yes(5) No(0)
• 1
  no. of ones in 1=(one one)11
  no. of ones in 11=(two ones)21
  no. of ones n twos in 1211=(one two,one one)1211
  no. of ones n twos in 111221=(three ones,two twos,one one)312211
• 11 years agoHelpfull: Yes(4) No(1)