find the odd man out:1,3,10,21,64,129,356,777

• 1=1
  3=3
  10=1+0=1
  21=2+1=3
  64=6+4=10=1+0=1
  129=1+2+9=12=1+2=3
  356=3+5+6=14=1+4=5( wrong one.. it should be 1)
  777=7+7+7=21=2+1=3
  
  Alternative 1 and 3 series.. this is method is correct..
• 9 years agoHelpfull: Yes(7) No(0)
• the answr is 356 because 1*2+1,3*3+1,10*2+1, and so on
• 9 years agoHelpfull: Yes(3) No(0)
• 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 this has followed the multiplication of the number with 2+1 and the next element multiplied with 3 and one added to it, so the odd number in the series is 356
• 8 years agoHelpfull: Yes(3) No(0)
• 1*2+1=3
  3*3+1=10
  10*2+1=21
  21*3+1=64
  64*2+1=129
  129*3+1=388(correct one is this instead of 356....)
  388*2+1=777
• 7 years agoHelpfull: Yes(1) No(0)
• if we take the difference between the numbers 2,7,11,43,65,227,421 this are not divisible any other numbers numbers except 65 so ans is 64 i think
• 9 years agoHelpfull: Yes(0) No(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 (this is wrong)
  388*2+1=777
• 7 years agoHelpfull: Yes(0) No(0)
• 1 3 10 21 64 129 356 777
  1*2+1 3*3+1 10*2+1 21*3+1 64*2+1 129*3+1=359
  So, odd is 356
• 5 years agoHelpfull: Yes(0) No(0)