NIELIT 2021 Dec Scientist B - Section A: 4

Question

Directions $(3-5) :$ In each of the following questions, one number is wrong in the series. Find out the wrong number.

$1, 9, 25, 49, 86, 121 :$

• A. $25$
• B. $121$
• C. $166$
• D. $86$

Answer 1

The given series is having square value of odd number like $1,3,5,7,9,11...$

• $1^2=1$
• $3^2=9$
• $5^2=25$
• $7^2=49$
• $9^2=81\rightarrow(86)$ which is wrong here.
• $11^2=121$

So option $(D)$ is correct here.