70,54,45,41,?
a)35
b)36
c)38
d)40

• 45 - 41 = 4 ; 54 - 45 = 9 ; 70 - 54 = 16
  Now, difference series is 4,9,16
  so
  16 - 9 = 7
  9 - 4 = 5
  Therefore the second series is updating as like as ( 3 , 5 , 7, .... )
  4 - 3 = 1
  So
  41 - 1 = 40
• 9 years agoHelpfull: Yes(1) No(1)
• option d)40
  70-(4^2)=54
  54-(3^2)=45
  45-(2^2)=41
  so,
  41-(1^2)=40
• 9 years agoHelpfull: Yes(0) No(0)
• d) 40
  as 70-54=16 i.e. 4^2
  54-45=9 i.e. 3^2
  45-41=4 i.e. 2^2
  and the next will be 1^2 which is 1, then 41-1 which is equal to 40
  
• 8 years agoHelpfull: Yes(0) No(0)
• Answer is option d) because the difference between successive numbers is a perfect square series
  70-54=16=4^2
  54-45=9=3^2
  45-41=4=2^2
  so next 1 should be the difference.
• 8 years agoHelpfull: Yes(0) No(0)