Insert the missing number
165, 195, 255, 285, 345, ...
A. 375 B. 420
C. 435 D. 390

• Answer is A. 375.
  
  165, 195, 255, 285, 345, ...has two different seriers with 90 difference between two numbers
  165, 255, 345...
  195, 285, ..... 375 is the next number
• 12 years agoHelpfull: Yes(7) No(0)
• Ans = A)375
  Exp = 165 + 30 = 195
  195 + 60 = 255
  255 + 30 = 285
  285 + 60 = 345
  345 + 30 = 375
  
  $ Vignesh(India,TamilNadu) $
• 12 years agoHelpfull: Yes(2) No(0)
• +30+60-----------------------345+30=375
• 12 years agoHelpfull: Yes(1) No(0)
• difference between 1st and 2nd number, 3rd and 4th number is 30
  answer is 345+30=375
• 12 years agoHelpfull: Yes(1) No(0)
• ans:A the difference between the terms are 30,60,30..so after 345 add 30 its 375.
• 12 years agoHelpfull: Yes(1) No(0)
• ans: a 375
  
  165, 195, 255, 285, 345, ...375
  difference: 30 60 30 60 30
  
• 12 years agoHelpfull: Yes(1) No(0)
• 165+30=195 , 195+60=255, 255+30=285, 285+60=345, 345+30=375..
• 8 years agoHelpfull: Yes(0) No(0)
• one method is like this
  the sum of three digit of first no is 12 and second is 15 like
  1+6+5=12 & 1+9+5=15
  alternate no follow this series so ans will be 375
• 6 years agoHelpfull: Yes(0) No(0)