Missing Number (SSC CHSL 2019 Tier -1)

1. Find the missing number? [SSC CHSL 17/03/2020 (Morning)]

(a) 31
(b) 21
(c) 23
(d) 17

Correct Answer: (a) 31

Solution:In first figure: (25)² - (5)² = 625 - 25 = 600

In second figure: (27)² - (3)² = 729 - 9 = 720

Similarly, In the third figure: (7)² - (9)² = 880 ⇒ (?)² = 880 + 81 = 961 ? = √961 = 31

2. Find the missing number? [SSC CHSL 17/03/2020 (Morning)]

(a) 46
(b) 23
(c) 10
(d) 25

Correct Answer: (b) 23

Solution:10 + 5 + 6 ⇒ 21 × 2 = 42

17 + 3 + 14 ⇒ 34 × 2 = 68

8 + 15 + 23 ⇒ 46 × 2 = 92

So, 23 will be the answer.

3. Find the missing number? [SSC CHSL 17/03/2020 (Afternoon)]

(a) 22
(b) 49
(c) 17
(d) 65

Correct Answer: (a) 22

Solution:(5 6 4 26) → 5 × 6 - 4 = 26

(6 5 3 7) → 7 × 6 - 5 = 37

(4 8 10 ?) → 4 × 8 - 10 = 22

4. Find the missing number? [SSC CHSL 17/03/2020 (Evening)]

(a) 11
(b) 15
(c) 21
(d) 19

Correct Answer: (c) 21

Solution:9 + 1 ⇒ 10 × 13 = 130

14 + 1 ⇒ 15 × 9 = 135

7 + 1 ⇒ 8 × 21 = 168

5. Find the missing number? [SSC CHSL 18/03/2020 (Evening)]


	26			25			?
4		6	7		1	5		3

(a) 17
(b) 24
(c) 19
(d) 22

Correct Answer: (a) 17

Solution:(4)² + (6)² 16 + 36 = 52, 52/ 2 = 26

(7)² + (1)² = 49 + 1 = 50; 50 / 2 = 25

Similarly,
(5)² + (3)² = 25 + 9 = 34;
34/2 = 17

6. Find the missing number? [SSC CHSL 19/03/2020 (Morning)]

(a) 13
(b) 11
(c) 21
(d) 23

Correct Answer: (a) 13

Solution:

7. Find the missing number? [SSC CHSL 19/03/2020 (Morning)]

(a) 22
(b) 25
(c) 12
(d) 21

Correct Answer: (c) 12

Solution:In column (i), (11 + 5 + 3)² = (19)² = 361
In column (ii), (17 + 3 + 7)² = (27)² = 729
In column (iii), (8 + 15 + 12)² = (35)² = 1225

8. Find the missing number? [SSC CHSL 13/10/2020 (Evening)]

(a) 62
(b) 22
(c) 38
(d) 58

Correct Answer: (a) 62

Solution:In column (i), 16 + 4 = 20 ⇒ 20/2 = 10
In column (ii), 30 + 34 = 64 ⇒ 64/2 = 32
In column (iii), x + 62 = 80 ⇒ 80/2 = 40

9. Find the missing number? [SSC CHSL 14/10/2020 (Morning)]

(a) 3
(b) 6
(c) 4
(d) 7

Correct Answer: (c) 4

Solution:In column (iii), the number is the square of the sum of numbers in the first two columns.
6 + 4 = 10 ⇒ (10)² = 100
7 + 5 = 12 ⇒ (12)² = 144
Similarly, 9 + 4 = 13 ⇒ (13)² = 169

10. Find the missing number? [SSC CHSL 15/10/2020 (Morning)]

(a) 24
(b) 29
(c) 30
(d) 27

Correct Answer: (d) 27

Solution:The middle column has the

HCF of numbers in the other two columns

HCF (162, 108) = 54 ⇒ ? = 54/2 = 27