Question

What number will replace the ?

$1,9,25,49,81,?$

• A. $100$
• B. $112$
• C. $121$
• D. $144$

Answer 1

The correct option is C $121$

The series consists of squares of consecutive odd numbers i.e.
$1^2$, $3^2$, $5^2$, $7^2$, $9^2$, .
So,missing term $={11}^2=121$
Hence,option C is the correct answer.