Number Series – Part 4 | Find the Missing Number: 20 General Intelligence Questions

 Welcome to Part 4 of our Number Series practice series! This set contains 20 new questions focused on finding the missing number in a sequence.

Analyze each series carefully, identify the mathematical or logical pattern, and determine the number that completes the sequence. These questions are designed to improve logical reasoning, numerical ability, pattern recognition, and analytical thinking.

Perfect for General Intelligence, Mental Ability, Olympiad, scholarship, and competitive exam preparation.

Challenge yourself and try to solve all 20 questions before checking the answers!

Number Series Mastery: Set 4

Master 20 brand-new logical concepts including product of digits, metallic ratios, composite gaps, alternating prime powers, double-factorial growth, and nested digital transformations!

Question 1: Product of Digits Addition (+ Product of Digits)

14

18

26

38

?

(A) 52

(B) 58

(C) 62

(D) 64

Question 2: Pell Sequence (2Tₙ₋₁ + Tₙ₋₂)

0

1

2

5

12

29

?

(A) 68

(B) 70

(C) 72

(D) 75

Question 3: Consecutive Composite Numbers Addition (+4, +6, +8, +9...)

5

9

15

23

32

?

(A) 40

(B) 41

(C) 43

(D) 42

Question 4: Polynomial Progression (n³ - n)

0

6

24

60

120

?

(A) 210

(B) 216

(C) 180

(D) 204

Question 5: Alternating Multiply and Subtract (×3 - 1, ×3 - 2, ×3 - 3...)

2

5

13

36

?

(A) 100

(B) 102

(C) 104

(D) 108

Question 6: Subtracting Double Factorials (-1!!, -2!!, -3!!, -4!!...)

100

99

97

94

86

?

(A) 68

(B) 71

(C) 73

(D) 70

Question 7: Difference of Cubes (+1³, +2³, +3³, +4³...)

5

6

14

41

105

?

(A) 210

(B) 225

(C) 226

(D) 230

Question 8: Interleaved Division and Subtraction (÷2, -3, ÷2, -3...)

80

40

37

18.5

15.5

?

(A) 7.75

(B) 12.5

(C) 8.25

(D) 6.75

Question 9: Alternating Powers of Prime Addition (+2¹, +3², +5³, +7⁴)

1

3

12

137

?

(A) 2250

(B) 2438

(C) 2538

(D) 2550

Question 10: Tetrahedral Numbers [n(n+1)(n+2) / 6]

1

4

10

20

35

?

(A) 50

(B) 56

(C) 52

(D) 60

Question 11: Alternating Reverse Digit Subtract (- Reverse Digits)

92

63

27

?

(A) -36

(B) 0

(C) -54

(D) -45

Question 12: Fibonacci Square Addition (+ Fₙ²)

0

1

2

6

15

?

(A) 40

(B) 31

(C) 39

(D) 41

Question 13: Variable Fractional Multiplier (×1/2, ×2/3, ×3/4...)

120

60

40

30

?

(A) 20

(B) 22.5

(C) 24

(D) 25

Question 14: Non-Prime Gap Progression (+1, +1, +2, +1...)

4

6

8

9

10

12

?

(A) 13

(B) 14

(C) 15

(D) 16

Question 15: Triple Recurrence with Decreasing Subtraction (Tₙ = 3Tₙ₋₁ - n)

1

2

4

9

23

?

(A) 60

(B) 62

(C) 66

(D) 64

Question 16: Interleaved Factorials and Triangular Numbers

1

1

2

3

6

6

24

?

(A) 10

(B) 12

(C) 120

(D) 15

Question 17: Multiplicative Digital Root Cycle

77

49

36

?

(A) 15

(B) 18

(C) 20

(D) 24

Question 18: Consecutive Primes Multiplied by Position (n × pₙ)

2

6

15

28

55

?

(A) 72

(B) 75

(C) 78

(D) 84

Question 19: Alternating Harmonic Differences (+12, +6, +4, +3...)

10

22

28

32

35

?

(A) 37.4

(B) 37.0

(C) 36.5

(D) 38.0

Question 20: Centered Square Numbers (2n² - 2n + 1)

1

5

13

25

41

?

(A) 57

(B) 59

(C) 60

(D) 61

2