Odd Man Out Series Aptitude Questions and Answer – Quantitative Aptitude

Odd Man Out Series Aptitude Questions and Answer – Tips & Tricks

Points to Remember

  1. Series: The sequence of numbers that obtained by some particular predefined rule is called series.
    1. Odd Number / Prime Number / Even Number: The serious may consist of odd number/ Prime Number and Even Number except one number, Which will be the odd man out.
    2. Perfect Squares / Cubes: These Series can be formed by squaring or cubing every successive number,
      1. Squares: 9 , 16, 49, 81…
      2. Cubes: 27, 64, 125, 216…
    3. Arithmetic Series: An arithmetic series is one in which successive numbers are obtained by adding (or subtracting) a fixed number to the previous number.
    4. Geometric Series: A Geometric Series is one in which each successive number is obtained by multiplying (or dividing) a fixed number any the previous number.
    5. Cumulative Series: In this type, the third number is the addition of previous two numbers
      • Example: 2, 4, 6, 10, 16, 26,….
    6. Power Series: The terms are defined on the basis of powers of numbers, the number may be expressed in the form of n3 – n.
    7. Mixed Series: A mixed series means a series which is created according to any non-conventional rule.
      1. Two-tier Arithmetic Series: It is one in which the difference of successive numbers themselves form an arithmetic series.
      2. Three-tier Arithmetic Series: It is difference of successive number forms a two-tier arithmetic series, whose successive term’s differences, in turn, create an arithmetic series.
      3. Arithmetic Series: In this, each successive term should e found by first adding a fixed number to the previous term and then multiplying it by another fixed number.
      4. Geometric Arithmetic Series: In this series, one in which each successive term is found by first multiplying / dividing the previous term by a fixed number and then adding or deducting another fixed number.
      5. Twin Series: In this, Two serious are packed in one.

Odd Man Out Series Aptitude Questions and Answer With Detailed ExplanationQuantitative Aptitude

Odd Man out and Series

Question 1
6, 9, 15, 21, 24, 28, 30
A
21
B
24
C
28
D
30
Question 1 Explanation: 
Answer: Option C
Explanation:
Each of the number except 28, is a multiple of 3.
Question 2
3, 5, 7, 12, 17, 19
A
19
B
17
C
5
D
12
Question 2 Explanation: 
Answer: Option D
Explanation:
Each of the numbers is a prime number except 12.
Question 3
331, 482, 551, 263, 383, 362, 284
A
262
B
383
C
331
D
551
Question 3 Explanation: 
Answer: Option B
Explanation:
In each number except 383, the product of first and third digits is the middle one.
Question 4
Find the odd man out 2, 5, 10, 17, 26, 37, 50, 64
A
50
B
37
C
26
D
64
Question 4 Explanation: 
Answer: Option D
Explanation:
(1 * 1) + 1 , (2 * 2) + 1, (3 * 3) + 1, (4 * 4) + 1, (5 * 5) + 1, (6 * 6) + 1, (7 * 7) + 1, (8 * 8) + 1
But, 64 is out of pattern.
Question 5
Insert the missing number.
8, 7, 11, 12, 14, 17, 17, 22, (....)
A
20
B
22
C
24
D
27
Question 5 Explanation: 
Answer: Option A
Explanation:
There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22) increasing by 3 and 5 respectively.
Question 6
Find the next number in the given series? 5, 25, 61, 113,....
A
142
B
181
C
156
D
179
Question 6 Explanation: 
Answer: Option B
Explanation:
Here the series follow the rule that
12 + 22 = 5
32 + 42 = 25
52 + 62 = 61
72 + 82 = 113
So, Next is 92 + 102 = 181
Question 7
Find the missing number in the given series?
2, 3, 6, 15, ?, 157.5
A
87
B
78.5
C
56.5
D
45
Question 7 Explanation: 
Answer: Option D
Explanation:
The given,
2, 3, 6, 15, ?, 157.5
2 * 1.5 = 3
3 * 2 = 6
6 * 2.5 = 15
15 * 3 = 45
45 * 3.5 = 157.5
Therefore, the missing number is 45
Question 8
Find out the wrong number in the given sequence of numbers.
56, 72, 90, 110, 132, 150
A
72
B
110
C
132
D
150
Question 8 Explanation: 
Answer: Option D
Explanation:
The numbers are 7*8 , 8*9, 9*10, 10*11, 11*12, 12*13
So, 150 is wrong
Question 9
Find the odd one out?
A
Hawk
B
Parrot
C
Owl
D
Eagle
Question 9 Explanation: 
Answer: Option C
Explanation:
All except Parrot are birds of prey.
Question 10
Find out the wrong number in the given sequence of numbers.
36, 54, 18, 27, 9, 18.5, 4.5
A
4.5
B
18.5
C
54
D
18
Question 10 Explanation: 
Answer: Option B
Explanation:
The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it.
There are 10 questions to complete.
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