Missing Number – Railway Reasoning part – 4

Total Questions: 50

31. Find the missing number to complete the following sequence: [RRB NTPC 11/03/2021 (Morning)]

Correct Answer: (c) 315
Solution:

3³ + 4⁴ + 2⁵ = 27 + 256 + 32 = 315

32. Find the missing number to complete the following sequence: [RRB NTPC 11/03/2021 (Morning)]

Correct Answer: (a) W
Solution:

C + 2 = E
E + 3 = H , H + 4 = L
L + 5 = Q , Q + 6 = W

33. Find the missing number to complete the following sequence: [RRB NTPC 12/03/2021 (Evening)]

Correct Answer: (a) 10
Solution:

In 1st figure , ⇒ 12 + 8 = 2² + 4² ⇒ 20 = 20
In 2nd figure , ⇒ 6 + 4 = 3² + 1² ⇒ 10 = 10
Similarly, in 3rd figure , ⇒ X + 19 = 5² + 2² ⇒ X = 10

34. Find the missing number to complete the following sequence: [RRB NTPC 12/03/2021 (Evening)]

Correct Answer: (d) 28
Solution:

In 1st fig. → 8² − 2² = 64 − 4 = 60
In 2nd fig. → 3² − 2² = 9 − 4 = 5
In 3rd fig. → 8² − 6² = 64 − 36 = 28

35. Find the missing number to complete the following sequence: [RRB NTPC 13/03/2021 (Morning)]

Correct Answer: (c) 40
Solution:

Logic :- 15 + (10 - 5 ) = 20
27 + (11 - 8 ) = 30
45 + ( 10 - 15) = 40

36. Find the missing number to complete the following sequence: [RRB NTPC 13/03/2021 (Evening)]

Correct Answer: (a) 1
Solution:

Logic :
7 × 6 = 42 , 42 × 6 = 252 , 252 × 6 = 1512

37. Find the missing number to complete the following sequence: [RRB NTPC 14/03/2021 (Morning) ]

Correct Answer: (d) 162
Solution:

Logic : Sum of Square of biggest value and cube of remaining values 16 + 27 + 8 = 51
64 + 343 + 125 = 532
36 + 125 + 1 = 162

38. If 24 B 6 B 12 = 42 and 31 B 7 B 13 = 51, then 64 B 9 B 4 = ? [RRB NTPC 15/03/2021 (Morning)]

Correct Answer: (b) 77
Solution:

Where , B = + 24 + 6 + 12 = 42
42 = 42 ( LHS = RHS )
So , 64 + 9 + 4 = 77

39. Then, what number will replace the question mark? [RRB NTPC 15/03/2021 (Evening)]

If 190 = 101
191 = 122
192 = 145
193 = 170
194 = ?

Correct Answer: (c) 197
Solution:

Logic: - squares of sum of digits of given number + 1(1 + 9 + 4)² + 1
= 14² + 1 = 196 + 1 = 197

40. Find the missing number to complete the following sequence: [RRB NTPC 19/03/2021 (Morning)]

Correct Answer: (b) 17
Solution:

4 × 6 = 24
3 × 5 = 15
5 × 6 = 30