Q. What is the missing number of the following sequence
4,25,130, ? ,3280

• 4
  4
  4*5+5=25
  25*5+5=130
  130*5+5=655
  655*5+5=3280
  so answer is 655.
  
• 10 years agoHelpfull: Yes(31) No(0)
• 655
  (4×5)+5 = 25
  (25×5)+5 = 130
  (130×5)+5 = 655
  (655×5)+5 = 3280
• 10 years agoHelpfull: Yes(6) No(0)
• look series
  T(n)=(T(n-1)+1)^2
  (4+1)^2=25
  (25+1)^2=130
  (130+1)^2=655
  (655+1)^2=3280....
  
  so ans is (130+1)^2=655.........
• 10 years agoHelpfull: Yes(2) No(6)
• 4*5+5=25
  25*5+5=130
  130*5+5=655
• 10 years agoHelpfull: Yes(1) No(0)
• (31) 7,4,6,3,4.5,1.5,2.25,0.75,?
  7-3=4; 4*(3/2)=6 ;
  6-3=3; 3*(3/2)=4.5;
  4.5-3=1.5; 1.5*(3/2)=2.25;
  2.25-3=-0.75; -0.75*(3/2)= -1.125
  Ans: -1.125
• 7 years agoHelpfull: Yes(1) No(0)
• (66) (36,42),(16,20),(36,42),(4,?)
  => (6^2=36+6=42), (4^2=16+4=20), (6^2=36+6=42), (2^2=4+2=6). So 6 Answer
• 7 years agoHelpfull: Yes(1) No(0)
• look series
  T(n)=(T(n-1)+1)*5
  (4+1)*5=25
  (25+1)*5=130
  (130+1)*5=655
  (655+1)*5=3280....
  
  so ans is (130+1)*5=655........
  
  
• 10 years agoHelpfull: Yes(0) No(0)
• 4*5+5=25
  25*5+5=130
  130*5+5=655
  655*5+5=3280
• 10 years agoHelpfull: Yes(0) No(0)
• Ans) 655
  (4*5)+5=25
  (25*5)+5=130
  (130*5)+5=655
  (655*5)+5=3280
• 7 years agoHelpfull: Yes(0) No(0)