Test Index

Series and Odd Man out Practice Test 2

Question : 15 of 40

Marks: +1, -0

?, 23, 34, 45, 56, 78

Solution:

Concept:

The series is formed by writing consecutive natural-number pairs as two-digit terms.

Explanation:

The terms after the missing number are:

23, 34, 45, 56, 78

Each term joins two consecutive integers:

2

and

3

\rightarrow

23

3

and

4

\rightarrow

34

4

and

5

\rightarrow

45

5

and

6

\rightarrow

56

7

and

8

\rightarrow

78

So the term before

23

should join

1

and

2

Thus, the missing term is

12

Answer:

12

(Option E)

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