80 370 ? 1550 2440 3530
a) 900
b) 840
c) 750
d) 860

• answer is d) 860
  
  10^2 - 20 = 80
  20^2 - 30 = 370
  30^2 - 40 = 860
  40^2 - 50 = 1550
  50^2 - 60 = 2440
  60^2 - 70 = 3530.
• 12 years agoHelpfull: Yes(27) No(0)
• d) 860
  
  in this question, last digit is ends with 0 and 2nd last digit is making a inverse series i.e. 8,7,?,5,4,3...
  so it will be 860.
• 12 years agoHelpfull: Yes(18) No(3)
• ANS:(d)=860
  Explaination:if we find the diffference from last we will come into solution (i.e)
  3530-2440=1090,2440-1550=890,if we note the two solutions their diff is 1090-890=200,hence the next value diff will be also 200,hence 890-200=690,690-200=490
  so 370+490=860
• 12 years agoHelpfull: Yes(5) No(2)
• answer is 860,since it is following a sequence as;
  80+290=370 (difference is of 200 b/w each added number)
  370+490=860
  860+690=1550
  1550+890=2440
  2440+1090=3530
• 12 years agoHelpfull: Yes(4) No(0)
• observe the last two digits in the series we have
  80
  70
  60---- so 860 is the answer
  50
  40
  30
  
  
  
• 10 years agoHelpfull: Yes(3) No(0)
• 80,370,860,1550,2440,3530
  here tens value was decreased by 10 in every number.
  so the answer is 860
• 12 years agoHelpfull: Yes(2) No(0)
• ANS:(d)=860
  Explaination:if we find the diffference from last we will come into solution (i.e)
  3530-2440=1090,2440-1550=890,if we note the two solutions their diff is 1090-890=200,hence the next value diff will be also 200,hence 890-200=690,690-200=490
  so 370+490=860
• 12 years agoHelpfull: Yes(1) No(1)
• d)860.
  its addin a series of 290,490,690,890...
• 12 years agoHelpfull: Yes(0) No(0)
• 10^2 - 20 = 80
  20^2 - 30 = 370
  30^2 - 40 = 860
  40^2 - 50 = 1550
  50^2 - 60 = 2440
  60^2 - 70 = 3530.
  
• 9 years agoHelpfull: Yes(0) No(0)
• solution 750
• 7 years agoHelpfull: Yes(0) No(1)
• 860 (30+10=40,40+10=50,50+10=60,60+10=70,70+10=80)
• 6 years agoHelpfull: Yes(0) No(0)
• Difference between 2nd and 1st number = 290
  Difference between 5th and 4th number = 890
  Difference between 6th and 5th number = 1090
  Therefore difference between 3rd and 2nd number = 490
  Third number = 370 + 490 = 860
  Fourth number = 860 + 690 = 1550
  Answer d is correct.
  AK
• 1 year agoHelpfull: Yes(0) No(0)