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Series and Odd Man out Practice Test 2

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Question : 18 of 40

Marks: +1, -0

4, 25, 100, 289, 652, 1369, 2500

2022
342
676
978
1580

Solution:

Concept:

The series follows a square pattern of the form

(n^2+1)^2

, so find the term that breaks it.

Explanation:

For

n=1

:

(1^2+1)^2 = 2^2 = 4

.

For

n=2

:

(2^2+1)^2 = 5^2 = 25

.

For

n=3

:

(3^2+1)^2 = 10^2 = 100

.

For

n=4

:

(4^2+1)^2 = 17^2 = 289

.

For

n=5

:

(5^2+1)^2 = 26^2 = 676

, not

652

.

For

n=6

:

(6^2+1)^2 = 37^2 = 1369

.

For

n=7

:

(7^2+1)^2 = 50^2 = 2500

.

Thus,

652

is the wrong term and should be replaced by

676

.

Answer:

676

, which is option C.

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