1,11,21,_ what comes in the next series.

• 31
  1+10=11
  11+10=21
  21+10=31
• 9 years agoHelpfull: Yes(8) No(0)
• the next num in the series is 1211
• 8 years agoHelpfull: Yes(8) No(2)
• there are two possible answer to the question...
  1. 31 as common difference is 10
  2. 1211.. current number defines the previous number out of which 1st number say the no. digit and 2nd the digit itself... for eg. 2nd number say there is only one 1 in 1st number, similarly 3rd number says there are 2 1s in 2nd number, 4rth number will say there are that there is one 2 and one 1 in 3rd number i.e. 1211, 5th will say there are one 1 one 2 and two 1.. i.e 111221, 6th= three 1, two 2, one 1=312211 and so on... so the series will be 1,11,21,1211,111221,312211,13112221,1113213211,31131211131221,....... and so on
  thank you
• 8 years agoHelpfull: Yes(7) No(0)
• Ans- 1211
  The first no. is 1
  The second is 11 which tells that there is one 1
  The third is 21 which tells that there are two 1s
  therefore the next no. should be 1211
  
• 8 years agoHelpfull: Yes(5) No(3)
• ANS IS 31
  Y BCOZ
  THE COMMON DIFFERENCE BETWEEN THE TERMS IS 10
• 9 years agoHelpfull: Yes(3) No(0)
• 31...............
• 9 years agoHelpfull: Yes(1) No(0)
• sorry actually the answer will be 31
  
• 9 years agoHelpfull: Yes(1) No(0)
• 1
  11 one time 1 is there
  21 two times 1 is there
  1211 one time 2 and then one time 1
• 8 years agoHelpfull: Yes(1) No(0)
• 1+10=11,11+10=21 so 21+10=31
  
  ans:31
  
• 9 years agoHelpfull: Yes(0) No(0)
• 1+10=11,11+10=21,21+10=31
  
  Ans:31
• 9 years agoHelpfull: Yes(0) No(0)
• 1+10=11,11+10=21,21+10=31
• 9 years agoHelpfull: Yes(0) No(0)
• 1+10=11,11+10=21,21+10=31
  
  ans=31
• 9 years agoHelpfull: Yes(0) No(0)
• 0+1=1, 1+1=11, 2+1=21, 3+1=31.
  ans = 31
• 9 years agoHelpfull: Yes(0) No(0)
• 1
  1+10=11
  11+10=21
  21+10=31
  ans 31
• 9 years agoHelpfull: Yes(0) No(0)
• 31, add 10 at each step to get next term
• 9 years agoHelpfull: Yes(0) No(0)
• the answer will be -10
  because
  1-11=-10
  21-11=-10
• 9 years agoHelpfull: Yes(0) No(3)
• 31.
  each number have 10 difference
• 8 years agoHelpfull: Yes(0) No(0)
• 1+10=11
  11+10=21
  21+10=31
  
• 8 years agoHelpfull: Yes(0) No(0)
• 1+10=11
  11+10=21
  now 21+10=31
  so....31 is the write answer
  
• 8 years agoHelpfull: Yes(0) No(0)
• 31
  11-1=10
  21-11=10
• 8 years agoHelpfull: Yes(0) No(0)
• 31
  1+10=11
  11+10=21
  21+10=31
• 8 years agoHelpfull: Yes(0) No(0)
• difference between successive terms is 10 , so answer will be 31
  
• 8 years agoHelpfull: Yes(0) No(0)
• 31 ,1+10=11,11+10=21,21+10=31.........
  
  
• 8 years agoHelpfull: Yes(0) No(0)
• 31
  sum up the digts
• 8 years agoHelpfull: Yes(0) No(0)
• 31,difference b/w any two numbers is 10
  
• 8 years agoHelpfull: Yes(0) No(0)
• answer is 31.
• 8 years agoHelpfull: Yes(0) No(0)
• 1, 10+1 , 20+1 , 30+1=31
  
• 8 years agoHelpfull: Yes(0) No(0)
• 31..
  1+10=11
  11+10=21.
  21+10=31..
• 8 years agoHelpfull: Yes(0) No(0)
• 1,1_1,2_1,.....according to this 1's remains same throughout
  so ans is 31
  
• 8 years agoHelpfull: Yes(0) No(0)
• ans. is 31
• 8 years agoHelpfull: Yes(0) No(0)
• 31 because common difference ids 10
  
• 8 years agoHelpfull: Yes(0) No(0)
• 31.......................................................
• 8 years agoHelpfull: Yes(0) No(0)
• some no. should also be in series ...because it contain two or more answer.......
• 8 years agoHelpfull: Yes(0) No(0)
• 31
  1+10=11
  11+10=21
  21+10=31
• 8 years agoHelpfull: Yes(0) No(0)
• 31 diff is 10
• 8 years agoHelpfull: Yes(0) No(0)
• 31
  1+10=11
  11+10=21
  21+10=31
• 8 years agoHelpfull: Yes(0) No(0)
• 01
  11
  21
  IN 1'S DIGIT NO 1 IS CONSTANT
  BUT 10'S DIGIT DIFF IS 1 SO NEXT NO IS 31
• 8 years agoHelpfull: Yes(0) No(0)
• as there is a diff of 10
  so the ans will be 31
• 8 years agoHelpfull: Yes(0) No(0)
• there is a difference of 10 between the series elements i.e.(11-1=10) and (21-11=10)
  therefore,next term after 21 would be(21+10=31)
• 8 years agoHelpfull: Yes(0) No(0)
• 31
  difference between 1 &11 is 10 and 21&11 is also 10.So next number should be 31
  
• 8 years agoHelpfull: Yes(0) No(0)
• sine 1+10=11
  and 11+10=21
  so 21+10=31
  
• 7 years agoHelpfull: Yes(0) No(0)
• 1+10=11
  11+10=21
  21+10=31
• 7 years agoHelpfull: Yes(0) No(0)
• 31 is the answer y becz in the series if we observe the difference b/w each number is 10. so 21+10=31.
• 7 years agoHelpfull: Yes(0) No(0)
• 1211
  because the series says 1, 1 times 1,2 times 1,so next is 1 times 2 an 1 times 1
• 7 years agoHelpfull: Yes(0) No(0)
• the difference btw series is 10
  answer is 31
• 7 years agoHelpfull: Yes(0) No(0)
• 31,add 10 in next
• 7 years agoHelpfull: Yes(0) No(0)
• here,here,11-1=10
  and 21-11=10
  so next no 21+10=31
• 7 years agoHelpfull: Yes(0) No(0)
• 31
  
  difference is 10
• 7 years agoHelpfull: Yes(0) No(0)
• Ans is 31 1,1+10,1+20
• 7 years agoHelpfull: Yes(0) No(0)
• 31 as the difference is 10 from first no. to second no. and so on as the third no.
• 7 years agoHelpfull: Yes(0) No(0)
• 1 to 11 t0 21 then 31
• 7 years agoHelpfull: Yes(0) No(0)
• 1, 11, 21, 31, 41...
• 6 years agoHelpfull: Yes(0) No(0)
• ans:31
  the difference between the two adjacent numbers is 10
• 6 years agoHelpfull: Yes(0) No(0)
• ans:31
  the difference between the numbers is 10.
• 6 years agoHelpfull: Yes(0) No(0)
• difference is 11 next series is 31
• 6 years agoHelpfull: Yes(0) No(0)
• adding 10 to the result each time..then we get the required series.such as
  difference between 1 and 11 is 10
  difference between 11 and 21 is 10
  so the difference between the 21 and the next number should be 10
  so,21+10=31.
• 5 years agoHelpfull: Yes(0) No(0)
• 31
  for thier every numer is incremented by 10
• 5 years agoHelpfull: Yes(0) No(0)
• 31
  reason:difference between the two numbers is 10
• 5 years agoHelpfull: Yes(0) No(0)
• ans is 31 because
  lets a1=1
  a2=11
  a2=21
  and then difference between a2-a1=10
  similarly a3-a2=10
  hence difference between a4-a3=10
  so it means we need to add 10 in a3=21+10=31
• 5 years agoHelpfull: Yes(0) No(0)
• 1+10=11
  11+10=21
  21+10=31
• 5 years agoHelpfull: Yes(0) No(0)
• 31
  1+10=11
  11+10=21
  21+10=31
• 5 years agoHelpfull: Yes(0) No(0)
• 31
  continious substraction
• 5 years agoHelpfull: Yes(0) No(0)
• ans: 1121
  two possibilities are there and hence it's a google interview question the answer would not be 31.
  1,11,21,?
  1= one
  11= one one i.e., in previous thing there is only "one one".
  21 = two one's i.e., in previous thing there are "two 1's".
  ? = in previous thing there is "one 2 and one 1" hence answer is: 1211
  so...
  1,11,21,1211,?
  here ? is: 111221 (pronounce the previous occurrence of digits)
• 4 years agoHelpfull: Yes(0) No(0)
• 1,11,21
  01,(0+1)1,(0+1+1)1
  so the anser is 31
• 4 years agoHelpfull: Yes(0) No(0)
• 1+10=11,11+10=21,21+10=31
  Answer:31
• 4 years agoHelpfull: Yes(0) No(0)
• Answer is 1211.
• 4 years agoHelpfull: Yes(0) No(0)
• 1,1+10=11,11+10=21,21+10=31
• 3 years agoHelpfull: Yes(0) No(0)
• the ans is 1211
• 3 years agoHelpfull: Yes(0) No(0)
• 1,11,21,31,41,.....
  
  add 10 to each number
• 3 years agoHelpfull: Yes(0) No(0)
• 31 10+1,11+1,21+10-=31
• 1 year agoHelpfull: Yes(0) No(0)