Test Index

Series and Odd Man out Practice Test 1

Question : 16 of 40

Marks: +1, -0

1, 4, 5, 25, 9, 81, 13, 169

Solution:

Concept:

The sequence is made of pairs of the form

n, n^2

Explanation:

Group the terms as pairs:

(1,4)

(5,25)

(9,81)

(13,169)

In each pair, the second term should be the square of the first term.

Check:

5^2=25

9^2=81

, and

13^2=169

, so these pairs are correct.

But

1^2=1

, not

4

Therefore,

4

is the wrong term.

Answer:

Go to Question:

Prev Question

Next Question