Number Series – Part 1 | Find the Missing Number: 20 General Intelligence Questions

 Welcome to Part 1 of our Number Series practice series! This set contains 20 questions designed to test your numerical reasoning, pattern recognition, and logical thinking skills.

In each question, identify the pattern in the given number series and find the missing number. The questions gradually challenge you to recognize different patterns involving addition, subtraction, multiplication, division, squares, and other mathematical relationships.

These questions are useful for General Intelligence, Mental Ability, Olympiad, scholarship, and competitive exam preparation.

Number Series Mastery: 20 Unique Patterns

Explore 20 distinct logical rules for finding the missing term in various number series based on different mathematical concepts. Click an option for immediate feedback.

Question 1: Consecutive Product Rule [n × (n+1)]

2

6

12

20

?

(A) 28

(B) 30

(C) 32

(D) 36

Question 2: Increasing Even Differences (+4, +6, +8, +10...)

2

6

12

20

?

(A) 26

(B) 28

(C) 30

(D) 34

Question 3: Square Plus Self Rule (n² + n)

2

6

12

20

?

(A) 24

(B) 27

(C) 29

(D) 30

Question 4: Next Square Minus Self Rule [(n+1)² - (n+1)]

2

6

12

20

?

(A) 30

(B) 32

(C) 35

(D) 40

Question 5: Second Level Constant Difference (D2 = +2)

2

6

12

20

?

(A) 26

(B) 28

(C) 30

(D) 32

Question 6: Prime Multiplication Pattern

2

6

15

35

?

(A) 70

(B) 77

(C) 85

(D) 91

Question 7: Triangular Numbers Multiplied by 2

2

6

12

20

?

(A) 24

(B) 26

(C) 28

(D) 30

Question 8: Multiplicative Recursion (x1.5, x2, x2.5...)

2

3

6

15

?

(A) 45

(B) 37.5

(C) 40

(D) 50

Question 9: Polynomial Sum [n(n + 1)(n + 2) / 3]

2

8

20

40

?

(A) 60

(B) 65

(C) 70

(D) 80

Question 10: Fibonacci-Like Sum of Previous Two Terms (+2 offset)

2

6

10

18

?

(A) 28

(B) 30

(C) 32

(D) 34

Question 11: Cube Minus Square Rule (n³ - n²)

0

4

18

48

?

(A) 80

(B) 90

(C) 96

(D) 100

Question 12: Interleaved Sub-Series (Even & Odd Positions)

2

5

6

10

12

15

?

(A) 20

(B) 18

(C) 22

(D) 24

Question 13: Geometric Multiplier Sequence (×3, ÷2, ×3, ÷2...)

2

6

3

9

4.5

?

(A) 9

(B) 12

(C) 13.5

(D) 15

Question 14: Prime Difference Pattern (+2, +3, +5, +7, +11...)

2

4

7

12

19

?

(A) 28

(B) 30

(C) 31

(D) 32

Question 15: Factorial Division Pattern [n! / (n - 1)]

2

3

8

30

?

(A) 120

(B) 136

(C) 140

(D) 144

Question 16: Perfect Cubes Plus Constant (n³ + 1)

2

9

28

65

?

(A) 110

(B) 120

(C) 126

(D) 130

Question 17: Doubling Difference Series (+4, +8, +16, +32...)

2

6

14

30

?

(A) 62

(B) 58

(C) 60

(D) 64

Question 18: Perfect Squares Difference (+1, +4, +9, +16...)

2

3

7

16

?

(A) 30

(B) 32

(C) 34

(D) 36

Question 19: Alternating Add and Multiply Pattern (+2, ×2, +2, ×2...)

2

4

8

10

20

?

(A) 24

(B) 40

(C) 22

(D) 26

Question 20: Digital Sum Addition Pattern

2

4

8

16

23

?

(A) 28

(B) 30

(C) 32

(D) 35

2