Missing Number (SSC CPO 2020 Tier -1)

1. Find the missing number? [SSC CPO 23/11/2020 (Morning)]

(a) 4
(b) 6
(c) 5
(d) 7

Correct Answer: (c) 5

Solution:In each column (a+1) × (b+1) = c
So, 48 = (5+1) × (7+1)

5 is the correct answer.

2. Find the missing number? [SSC CPO 23/11/2020 (Morning)]

(a) 22
(b) 30
(c) 39
(d) 32

Correct Answer: (d) 32

Solution:Logic: (a, b, 4(a-b))
(54 - 40) × 4 = 56
(68 - 57) × 4 = 44
Similarly, (47 - 39) x 4 = 32

3. Find the missing number? [SSC CPO 23/11/2020 (Morning)]

(a) 188
(b) 150
(c) 194
(d) 176

Correct Answer: (c) 194

Solution:Logic: In each row, first term x 2 + 2 gives the next term.
28 × 2 + 2 = 58, 58 × 2 + 2 = 118
Similarly in the second row,
In the third row, 47 × 2 + 2 = 96, 96 × 2 + 2 = 194

4. Find the missing number? [SSC CPO 23/11/2020 (Evening)]

(a) 12
(b) 4
(c) 16
(d) 15

Correct Answer: (b) 4

Solution:Logic row wise: (a, b, ab/4)

(14 × 28) / 4 = 98, (7 × 48) / 4 = 84

Similarly, (x × 60) / 4 = 60, So x = 4

5. Find the missing number? [SSC CPO 23/11/2020 (Evening)]

(a) 258
(b) 280
(c) 240
(d) 320

Correct Answer: (b) 280

Solution:Logic: In each column (a+1) × c = b

So, (19+1) × 14 = 280

6. Find the missing number? [SSC CPO 23/11/2020 (Evening)]

(a) 114
(b) 120
(c) 119
(d) 129

Correct Answer: (c) 119

Solution:In first row, 54 + 18 = 72, 72 + 18 = 90
In second row, 79 + 18 = 97, 97 + 18 = 115
Similarly,
in third row, 83 + 18 = 101, 101, 101 + 18 = 119

7. Find the missing number? [SSC CPO 23/11/2020 (Evening)]

(a) 50
(b) 60
(c) 55
(d) 75

Correct Answer: (c) 55

Solution: Logic is: In each column

a,b a² - b²

So, 8² - 3² = 64 - 9 = 55

8. Find the missing number? [SSC CPO 24/11/2020 (Morning)]

(a) 21
(b) 30
(c) 17
(d) 23

Correct Answer: (c) 17

Solution:Logic: In each row (a, b, ab/2 ) = (14 × 26) ÷ 2 = 182

Similarly (x × 22) ÷ 2 = 187, so, x = 17

9. Find the missing number? [SSC CPO 24/11/2020 (Morning)]

(a) 32
(b) 24
(c) 37
(d) 28

Correct Answer: (d) 28

Solution:Logic: In each column a, b, 2a+b

17 × 2 + 15 = 49, 41 × 2 + 24 = 106

Hence X is equal to 28.

10. Find the missing number? [SSC CPO 24/11/2020 (Morning)]

(a) 144
(b) 208
(c) 192
(d) 110

Correct Answer: (d) 110

Solution:Logic: In each column ∛125 × 27 = 5 × 27 = 135

∛8 × 55 = 2 × 55 = 110

∛64 × 72 = 4 × 72 = 288