Missing Number (Varieties Questions)

1. Find the missing number? [SSC CGL 27/07/2023 (2nd shift)]

(a) 22
(b) 13
(c) 10
(d) 5

Correct Answer: (c) 10

Solution:(First number × 6) = (Second number × Third number)

(3, 9, 2) → (3 × 6) = 9 × 2 ⇒ 18 = 18

(8, 6, 8) → (8 × 6) = 6 × 8 ⇒ 48 = 48

Similarly,
(5, 3, ?) → (5 × 6) = 3 × 10 ⇒ 30 = 30

2. Find the missing number? [SSC CGL 27/07/2023 (1st shift)]

(a) 10
(b) 12
(c) 15
(d) 8

Correct Answer: (b) 12

Solution:First number = (Second number × Third number) ÷ 3

(4, 2, 6) → (2 × 6) ÷ 3 = 4
(9, 3, 9) → (3 × 9) ÷ 3 = 9

Similarly,
(24, 6, ?) → (6 × x) ÷ 3 = 24
x = (24 × 3) ÷ 6 = 12

3. Find the missing number? [SSC CGL 25/07/2023 (1st shift)]

(a) 31
(b) 27
(c) 25
(d) 30

Correct Answer: (b) 27

Solution:Logic:
(First number + Second number) + (First number ÷ 4) = Third number

First row: (16, 15, 35)
(16 + 15) + (16 ÷ 4) = 35

Second row: (12, 18, 33)
(12 + 18) + (12 ÷ 4) = 33

Similarly,
Third row: (8, 17, ?)
(8 + 17) + (8 ÷ 4) = 25 + 2 = 27

4. Find the missing number? [SSC CGL 17/07/2023 (4th shift)]

(a) 4
(b) 6
(c) 3
(d) 5

Correct Answer: (b) 6

Solution:Logic:
(Second number) ÷ 2 + Third number = (First number)

(14, 10, 9) → [(10 ÷ 2) + (9)] = 14
(6, 8, 2) → [(8 ÷ 2) + (2)] = 6

Similarly,
(8, 4, ?) → [(4 ÷ 2) + ?] = 8
? = 6

5. Find the missing number? [SSC MTS 17/05/2023 (Afternoon)]

(a) 800
(b) 1100
(c) 900
(d) 1300

Correct Answer: (c) 900

Solution: Logic:
(1st number)³ = (2nd number) × {(2nd number) - (1st number)}² ÷ 3rd number

First row: (6, 216, 180) → (6)³ = 216,
(216) - (6)² = 180

Second row: (8, 512, 448) → (8)³ = 512,
(512) - (8)² = 448

Similarly,
Third row: (10, 1000, ?) → (10)³ = 1000,
(1000) - (10)² = 900

6. Find the missing number? [SSC CGL 06/12/2022 (2nd Shift)]

(a) 12
(b) 21
(c) 32
(d) 23

Correct Answer: (c) 32

Solution:Logic:
{n² × 3 : n × 2 : n}

(243, 162, 9) → (9² × 3 : 9² × 2 : 9)
(108, 72, 6) → (6² × 3 : 6² × 2 : 6)

Similarly,
(48, 32, 4) → (4² × 3 : 4² × 2 : 4)

7. Find the missing number? [SSC CHSL 07/06/2022 (Evening)]

(a) 32
(b) 38
(c) 40
(d) 37

Correct Answer: (a) 32

Solution: Logic:
(a + b) × 2 + a = c

In first row: (7 + 9) × 2 → 32 + 7 = 39
In second row: (4 + 8) × 2 → 24 + 4 = 28

Similarly,
In the third row: (6 + 7) × 2 → 26 + 6 = 32

8. Find the missing number? [SSC CHSL 06/06/2022 (Morning)]

(a) 75
(b) 82
(c) 54
(d) 66

Correct Answer: (c) 54

Solution:(row wise) → (a × 3) - (b ÷ 3) = c

(19 × 3) - (81 ÷ 3) = 30, (42 × 3) ÷ (57 ÷ 3) = 107
(23 × 3) - (45 ÷ 3) = 54

9. Find the missing number? [SSC CHSL 01/06/2022 (Afternoon)]

(a) 78
(b) 73
(c) 63
(d) 68

Correct Answer: (c) 63

Solution:[a + (b × 4) + 1 = c]

In 1st row: 14 + (4 × 4) + 1 = 30 + 1 = 31
In 2nd row: 10 + (4 × 4) + 1 = 78 + 1 = 79
In 3rd row: 30 + (8 × 4) + 1 = 62 + 1 = 63

10. Find the missing number? [SSC CHSL 31/05/2022 (Evening)]

(a) 47
(b) 84
(c) 74
(d) 48

Correct Answer: (c) 74

Solution:(row wise) → (1st num × 2 + 2nd num × 3) - 2 = 3rd num

In 1st row,

(6 × 2) + (8 × 3) - (12 + 24) - 2 = 34
In 2nd row,
(3 × 2) + (2 × 3) - (6 + 6) - 2 = 10

Similarly, in 3rd row,
(11 × 2) + (18 × 3) - 22 + 54 ÷ 76 - 2 = 74