Find out the wrong term.
1, 3, 10, 21, 64, 129, 356, 777

A. 21 B. 129
C. 10 D. 356

• ans:
  1*2+1=3
  3*3+1=10
  10*2+1=21
  21*3+1=64
  64*2+1=129
  129*3+1=358
  ans 356
  maintain alternate
• 12 years agoHelpfull: Yes(0) No(1)