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

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

1. $25$
2. $121$
3. $166$
4. $86$

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.

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