what is X in the series

131 517 192 X

• arranging the numbers as 13 15 17 19 2 now according to this series the next in the series will be 21 and 23.
  so X=123
• 10 years agoHelpfull: Yes(77) No(2)
• 131 = 1+3+1 =5 (5)
  517 = 5+1+7 = 13 = 1+3 = 4 (4)
  192 = 1+9+2 = 12 = 1+2 = 3 (3)
  That means answer will be the number whose sum of digit is 2. Now answer will come from option.
• 10 years agoHelpfull: Yes(13) No(4)
• 13 15 17 19 21 23
  therefore x= 123
  
• 10 years agoHelpfull: Yes(9) No(0)
• ans is 578
• 10 years agoHelpfull: Yes(4) No(7)
• 517 - 131 = 386
  386+192 = 578 (ans)
• 10 years agoHelpfull: Yes(3) No(5)
• Ans is 123
• 10 years agoHelpfull: Yes(1) No(0)
• 517-131=386
  517-192=325
  192-131=61
  and also 386-325=61
  so we will compare from 517 192 and ?
  diff of 517-192=325
  so now we add 386 to 192 then it will become 578.
  verify:
  517-192=325
  578-192=386
  578-517=61
  386-325=61.
• 10 years agoHelpfull: Yes(0) No(3)
• 578 will be the answer we cant split the terms in series as 13 15 ....
• 10 years agoHelpfull: Yes(0) No(2)
• 131=>1+4,3-2,1+6==517
  517=>5-4,1+8,7-5==192
  192=>1+4,9-2,2+4==576
  
  So the answer will be 576
• 3 years agoHelpfull: Yes(0) No(0)