Question

In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.

121, 225, 361,

• A. 441
• B. 484
• C. 529
• D. 729

Answer 1

Answer: (C)

529

The numbers are ${11}^2,{15}^2,{19}^2,...i.e.{11}^2,(11+4^{\ast }1{)}^2,(11+4^{\ast }2{)}^2,....$
$\therefore$ Missing Number = $(11+4^{\ast }3{)}^2=(23{)}^2=529$.