Logical Reasoning-Number Series


Number Series


1. Which number would replace the question mark in series :
7, 12, 19, ?, 39

A. 24
B. 28
C. 31
D. 33

Answer : B. 28
Explanation :
Pattern is, +5, +7, +9
Missing Number = 19+9 = 28

2. Complete the series
1, 4, 9, 16, 25,….

A. 36
B. 38
C. 49
D. 52

Answer : A. 36
Explanation :
Series Pattern is +3, +5, +7, +9.
So next number = 25+11 = 36

3. Complete the series
20, 19, 17, …., 10, 5

A. 15
B. 16
C. 13
D. 14

Answer : D. 14
Explanation :
Pattern is, -1, -2, ..,.. , -5
So -3 and -4 will fill the blanks to make it a pattern. Next number will be 17-3 = 14

4. In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
2, 3, 5, 7, 11, x, 17

A. 12
B. 13
C. 14
D. 15

Answer : B. 13
Explanation :
Clearly, the given series consists of prime numbers starting from 2. The prime number after 11 is 13.
So, 13 is the missing number.

5. In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
1, 6, 13, 22, 33,

A. 44
B. 45
C. 46
D. 47

Answer : C. 46
Explanation :
The pattern is + 5, + 7, + 9, + 11,…
Missing number = 33 + 13 = 46.

6. In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.
1, 9, 17, 33, 49, 73,

A. 97
B. 98
C. 99
D. 100

Answer : A. 97
Explanation :
The pattern is + 8, + 8, + 16, + 24,….
Missing number = 73 + 24 = 97.

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