Find out the wrong term.
89, 78, 86, 80, 85, 82, 83

A. 83 B. 82
C. 86 D. 78

• As given the series is as follows:
  -11,+9,-7,+5,-3,+1
  89-11 = 78
  78+9 = 87
  87-7 = 80
  80+5 = 85
  85-3 = 82
  82+1 = 83
  
  so instead of 86 there should be the number 87 in the 3rd place of the series.
• 12 years agoHelpfull: Yes(3) No(0)
• 89,78,86,80,85,82,83
  check alternate nos
  78,80,82
  add =78+2,80+2
  2,2,2
  2nd alternate:
  89,86,85,83
  diff.=89-86=3,86-85=1,85-83=2
  3,1,2
  if we change 86 by 87then
  2,2,2
• 8 years agoHelpfull: Yes(0) No(0)