80,873,72,72,64,81,56,?
a)96
b)98
c)89
d)90

• odd place numbers 80, 72, 64, 56 are divisible by 8.
  even place numbers 873, 72, 81 are divisible by 9,so required number is in even place, from options 90 is only value visible by 9, so 90 is the answer.
• 8 years agoHelpfull: Yes(14) No(2)
• d) 90....There may be some error in the second no i.e. 873 rest is alternate (8*10_ 8*9, 9*8, 8*8, 9*9, 8*7,9*10=90)
• 8 years agoHelpfull: Yes(4) No(3)
• put 63 in place of 873.
• 8 years agoHelpfull: Yes(4) No(3)
• the second one 873 should be 63..
  
  odd places:-
  80/8=10
  72/8=9
  64/8=8
  56/8=7
  reminder decreses by 1
  
  even places:-
  63/9=7
  72/9=8
  81/9=9
  now the (d) option
  90/9=10
  increasing the reminder by 1 seems to be pretty logical,
  so option (d).
• 8 years agoHelpfull: Yes(4) No(0)
• odd places 8*10=80 ;even places 9*97=873
  8*9=72 9*8=72
  8*8=64 9*9=81
  9*10=90 (d)
• 7 years agoHelpfull: Yes(0) No(0)
• some mistake in question
  
• 7 years agoHelpfull: Yes(0) No(0)