Missing Number (SSC CGL 2020 Tier -1)

1. Find the missing number ? [SSC CGL 13/08/2021 (Morning)]

(a) 24
(b) 20
(c) 18
(d) 19

Correct Answer: (a) 24

Solution:Logic:
In each column: (2nd - 1st) × 4
(15 - 4) × 4 → 44, (21 - 6) × 4 → 60
Similarly, (? - 4) × 4 → 68, ? → 24

2. Find the missing number ? [SSC CGL 13/08/2021 (Evening)]

(a) 19
(b) 29
(c) 27
(d) 17

Correct Answer: (b) 29

Solution:Logic → In each column, a² : b : b - a.
Similarly, 9² = 81, 38, 38 - 9 = 29.
Hence, 29 is the correct answer.

3. Find the missing number ? [SSC CGL 16/08/2021 (Afternoon)]

(a) 10
(b) 12
(c) 8
(d) 4

Correct Answer: (c) 8

Solution:On solving column wise,
22 × 1 - 4 = 18, 18 × 2 - 4 = 32
32 × 1 - 8 = 24, 24 × 2 - 8 = 40
7 × 1 - 2 = 5, 5 × 2 - 2 = 8

4. Find the missing number ? [SSC CGL 16/08/2021 (Afternoon)]

(a) 5
(b) 4
(c) 6
(d) 15

Correct Answer: (a) 5

Solution:Logic → Column wise: [ab + a + b = c]
(6 × 8) + 6 + 8 = 48 + 14 = 62
(11 × 3) + 11 + 3 = 33 + 14 = 47
Similarly, (14 × 7) + 14 + 7 = 89, so ? = 5

5. Find the missing number ? [SSC CGL 17/08/2021 (Afternoon)]

(a) 31
(b) 27
(c) 29
(d) 33

Correct Answer: (c) 29

Solution:Logic → (3 × 5) - (2 × 2) = 11
(5 × 5) - (2 × 7) = 29
Similarly, (13 × 5) - (18 × 2) = 29

6. Find the missing number ? [SSC CGL 18/08/2021 (Morning)]

(a) 155
(b) 217
(c) 266
(d) 93

Correct Answer: (b) 217

Solution:Logic → Column wise: [a × b = c]
3 × 23 = 69, 5 × 27 = 135
Similarly, 7 × 31 = 217

7. Find the missing number ? [SSC CGL 18/08/2021 (Evening)]

(a) 50
(b) 55
(c) 45
(d) 40

Correct Answer: (c) 45

Solution:Logic (row wise): [a² + c = b]
3² + 4 = 9 + 4 = 13
6² + 31 = 36 + 31 = 67
Similarly, 5² + 20 = 25 + 20 = 45

8. Find the missing number ? [SSC CGL 20/08/2021 (Morning)]

(a) 21
(b) 18
(c) 23
(d) 19

Correct Answer: (a) 21

Solution:Logic (row wise): [b + a = 5c]
[34 - 12] × 5 = 22 × 5 = 110
[13 - 6] × 5 = 35
Similarly, [x - 9] × 5 = 5 × 45 = 60
5 × 105 = x = 21

9. Find the missing number ? [SSC CGL 20/08/2021 (Afternoon)]

(a) 28
(b) 20
(c) 26
(d) 24

Correct Answer: (d) 24

Solution:Logic (row wise): [c - a² - 1 = b]
(13 - 7)² - 1 = 6² - 1 = 36 - 1 = 35
(14 - 9)² - 1 = 5² - 1 = 25 - 1 = 24
Similarly, (24 - 13)² - 1 = (11)² - 1 = 120

10. Find the missing number ? [SSC CGL 20/08/2021 (Evening)]

(a) 126
(b) 124
(c) 122
(d) 128

Correct Answer: (a) 126

Solution:Logic Column wise: [a² - 4 = b] and b × 4 - 2 = c
3² - 4 = 5 and 5 × 4 - 2 = 18
6² - 4 = 32 and 32 × 4 - 2 = 126
8² - 4 = 60 and 60 × 4 - 2 = 238