1, 3, 10, 21, 64, 129, 356, 777

Odd man out

• Answer is :356
  series 1
  1*2+1=3
  3*3+1=10
  10*2+1=21
  21*3+1=64
  64*2+1=129
  129*3=1=388
  388*2+1=777 so on.............
• 12 years agoHelpfull: Yes(44) No(2)
• only 3 is prime no.
  ans 3
• 11 years agoHelpfull: Yes(4) No(2)
• odd one is 777
• 11 years agoHelpfull: Yes(1) No(11)
• 356 A x 2 + 1, B x 3 + 1, C x 2 + 1, D x 3 + 1 and so on.
  
  So, 356 is wrong.
  
• 11 years agoHelpfull: Yes(1) No(0)
• answer is 356
  it should be 388 instead of 356
• 10 years agoHelpfull: Yes(1) No(0)
• answer is option e
  
• 10 years agoHelpfull: Yes(0) No(0)
• 356 will be the answer as it should be 388 there.
• 9 years agoHelpfull: Yes(0) No(0)
• 1 because its not odd or even number
  
• 9 years agoHelpfull: Yes(0) No(0)
• odd one is 356
• 9 years agoHelpfull: Yes(0) No(0)
• Ans:356
  the series 1 and 3 are repeated
  10=1+0=1
  21->2+1=3
  64->6+4=10->1+0=1
  but 356->3+5+6=14=1+4=5
  so 356 is odd one
• 8 years agoHelpfull: Yes(0) No(0)