Missing Number – Railway Reasoning part – 2

Total Questions: 50

1. Find the missing term in the given series: [RRB NTPC 07/01/2021 (Evening)]

A2B, C12D, E30F, _____, I90J

Correct Answer: (c) G56H
Solution:

A2B, C12D, E30F, _____, I90J
From the given series we observe that two consecutive alphabets and the product of their place value is written in the middle. So the missing term = G56H

2. Find the missing number to complete the following sequence: [RRB NTPC 08/01/2021 (Evening)]

Correct Answer: (d) 6
Solution:

9 × 5 × 3 = 135
5 × 7 × 4 = 140
5 × 6 × 5 = 150

3. Find the missing number to complete the following sequence: [RRB NTPC 08/01/2021 (Evening)]

Correct Answer: (a) 20
Solution:

4 × 9 + 8 = 44
3 × 7 + 6 = 27
8 × 2 + 4 = 20

4. Find the missing number to complete the following sequence: [RRB NTPC 09/01/2021 (Evening)]

Correct Answer: (b) 6
Solution:

In each column the next number = 2 × previous number

5. Find the missing number to complete the following sequence: [RRB NTPC 11/01/2021 (Evening)]

Correct Answer: (d) 81
Solution:

Previous number + 4 = next number 77 + 4 = 81

6. Find the missing number to complete the following sequence: [RRB NTPC 11/01/2021 (Evening)]

Correct Answer: (d) 245
Solution:

Logic : Sum of squares of all numbers.
8² + 9² + 10² = 64 + 81 + 100 = 245

7. Find the missing number to complete the following sequence: [RRB NTPC 11/01/2021 (Evening)]

Correct Answer: (a) 89
Solution:

Logic : Square of 2nd no. + 1st number
9² + 8 = 89

8. Find the missing number to complete the following sequence: [RRB NTPC 11/01/2021 (Evening)]

Correct Answer: (d) 46
Solution:

Logic : Sum of all numbers = middle number
11 + 10 + 12 + 13 = 46

9. Find the missing number to complete the following sequence: [RRB NTPC 19/01/2021 (Morning)]

Correct Answer: (d) 60
Solution:

Write repeated terms in ascending order and multiply their sum by 3,2,1 respectively to get the middle term.
Now,

10. Find the missing number to complete the following sequence: [RRB NTPC 19/01/2021 (Morning)]

Correct Answer: (a) 9
Solution:

13 + 7 = 20 ÷ 5 = 4
13 + 7 = 20 ÷ 4 = 5
(x + 9) ÷ 3 = 6
x + 9 = 18 ⇒ x = 9