Series – Railway Reasoning part – 9

Total Questions: 50

1. R, W, B, G, L,? [RRB NTPC 31/01/2021 (Morning)]

Correct Answer: (d) Q
Solution:

Logic :- 1st letter + 5 = next letter
R + 5 = W, W + 5 = B, B + 5 = G
G + 5 = L, L + 5 = Q

2. P, 15, T, 19, X,? [RRB NTPC 31/01/2021 (Morning)]

Correct Answer: (b) 23
Solution:

Letter and its place value - 1 is written.
So the next term = Place value of X - 1
= 24 - 1 = 23

3. 113,127,131,137,139,149, ? RRB NTPC 31/01/2021 (Morning) [RRB NTPC 31/01/2021 (Morning)]

Correct Answer: (a) 151
Solution:

113, 127, 131, 137, 139, 149,?
All are Consecutive prime numbers
So the next prime number will be 151.

4. 110, 91, 74, 59, 46, ? [RRB NTPC 31/01/2021 (Evening)]

Correct Answer: (a) 35
Solution:

110 - 19 = 91
91 - 17 = 74
74 - 15 = 59
59 - 13 = 46
46 - 11 = 35

5. A series is given with one term missing. Select the correct alternative from the given ones that will complete the series [RRB NTPC 31/01/2021 (Evening)]

XPC, QHT, JZK, CRB, ?

Correct Answer: (d) VJS
Solution:

1st letter - 7 = 1st letter of next
2ndletter - 8 = 2nd letter of next
3rd letter - 9 = 3rd letter of next
Next will be = C - 7 = V, R - 8 = J,
B - 9 = S ⇒ VJS

6. Select the combination of letters that when sequentially placed in the blanks will create a repetitive pattern. [RRB NTPC 31/01/2021 (Evening) ]

_ baa _ aa _ aab _

Correct Answer: (a) abba
Solution:

Repetition of aba pattern.
a ba / a b a / a b a / ab a

7. 12, 8, 4, 0, - 4, ? [RRB NTPC 31/01/2021 (Evening)]

Correct Answer: (d) - 8
Solution:

12 - 4 = 8,
8 - 4 = 4,
4 - 4 = 0,
0 - 4 = - 4 ,
- 4 - 4 = - 8

8. Select the combinations of letters that when sequentially placed in the blanks will create a repetitive pattern. [RRB NTPC 31/01/2021 (Evening)]

_ stu _ vuts _ rst _ vvu _ sr

Correct Answer: (a) rvrut
Solution:

rstuv and its reverse is written.
r stu v / vuts r / rst u v/ vu t sr

9. E, J, O, T, ? [RRB NTPC 01/02/2021 (Morning)]

Correct Answer: (c) Y
Solution:

Logic-
E + 5 = J , J + 5 = O , O + 5 = T , T + 5 = Y

10. EF27, GI34, IL41, KO48, ? [RRB NTPC 01/02/2021 (Evening)]

Correct Answer: (b) MR55
Solution: