1, 5, 14, 30, 55, 91, ?

A. 130 B. 140
C. 150 D. 160

• B. 140
  
  Series is increasing +2^2, +3^2, +4^2, +5^2, +6^2, +7^2,
  
  1 +(2^2) = 5
  5 +(3^2) = 14
  14+(4^2) = 30
  30+(5^2) = 55
  55+(6^2) = 91
  91+(7^2) = 140
• 12 years agoHelpfull: Yes(5) No(0)
• 14-5=9 =3^2;
  30-14=16=4^2;
  55-30=5^2;
  91-55=6^2;
  then next no will be 91+7^2;
• 10 years agoHelpfull: Yes(1) No(1)