Missing Number – Railway Reasoning part – 3

Total Questions: 50

21. Find the missing number to complete the following sequence: [RRB NTPC 10/02/2021 (Morning)]

Correct Answer: (a) 40
Solution:

In the 1st fig. -- 6 + (8)² = 6 + 64 = 70
In the 2nd fig. -- 6 + (7)² = 6 + 49 = 55
In the 3rd fig -- 4 + (6)² = 4 + 36 = 40

22. Find the missing number to complete the following sequence: [RRB NTPC 11/02/2021 (Morning)]

Correct Answer: (d) 7
Solution:

30 - 12 = 26 - 8
51 - 50 = 13 - 12
23 - 18 = 12 - 7

23. Find the missing number to complete the following sequence: [RRB NTPC 11/02/2021 (Morning)]

Correct Answer: (a) I
Solution:

In 1st and 3rd row alphabet + 4 = next alphabet
In 2nd and 4th row , alphabet - 4 = next
alphabet M - 4 = I

24. Find the missing number to complete the following sequence: [RRB NTPC 11/02/2021 (Evening)]

Correct Answer: (c) 16
Solution:

4 × 5 = 8 + 12
5 × 3 = 7 + 8
6 × 4 = 8 + 16

25. Find the missing number to complete the following sequence: [RRB NTPC 15/02/2021 (Morning)]

Correct Answer: (a) 34
Solution:

5 × 2 + 6 + 6 = 22
4 × 5 + 9 + 5 = 34

26. Find the missing number to complete the following sequence: [RRB NTPC 15/02/2021 (Morning)]

Correct Answer: (d) 28
Solution:

6² − 2² = 32
9² − 6² = 45 , 4² − 1² = 15
8² − 6² = 28

27. Find the missing number to complete the following sequence: [RRB NTPC 15/02/2021 (Morning)]

Correct Answer: (a) 2
Solution:

(8 + 40) ÷ (12 + 4) = 3
(15 + 20) ÷ (5 + 2) = 5
(16 + 6) ÷ (9 + 2) = 2

28. Find the missing number to complete the following sequence: [RRB NTPC 15/02/2021 (Morning)]

Correct Answer: (c) 37
Solution:

3 × 9 + 3 = 30
8 × 6 + 2 = 50
5 × 6 + 7 = 37

29. In the given equation: [RRB NTPC 15/02/2021 (Morning)]

The function of the ☎ and 📞 remains unchanged. What does the question mark (?) stand for in the third equation?
A ☎ B = A² ÷ B
A 📞 B = A + B²
(4 ☎ 2) 📞 2 = ?

Correct Answer: (c) 12
Solution:

(4² ÷ 2) + 4
8 + 4 = 12

30. Find the missing number to complete the following sequence: [RRB NTPC 16/02/2021 (Morning)]

Correct Answer: (a) R
Solution:

Use of alphabetic opposite places .
Q ↔ J, S ↔ H, X ↔ C
Similarly, G ↔ T Use of alphabetic opposite places .
Q ↔ J, S ↔ H, X ↔ C
Similarly, G ↔ T