Series – Railway Reasoning part – 9

Total Questions: 50

11. Identify the term that does NOT belong to the following series: [RRB NTPC 02/02/2021 (Morning)]

A5, F11, K24, P51, T105, Z217

Correct Answer: (c) T105
Solution:

A + 5 = F, F + 5 = K, K + 5 P, P + 5 T

12. Identify the term that does NOT belong to the following series. [RRB NTPC 02/02/2021 (Morning)]

2T3, 5S6, 11R9, 16Q12, 23P15,

Correct Answer: (d) 16Q12
Solution:

These are alternate prime numbers

13. 14, 2, 28, 3, 84, 4, ? [RRB NTPC 02/02/2021 (Morning)]

Correct Answer: (c) 336
Solution:

14 × 2 = 28
28 × 3 = 84
84 × 4 = 336

14. 2A, 3C, 5F, 7J, 11O, ? [RRB NTPC 02/02/2021 (Evening)]

Correct Answer: (a) 13U
Solution:

These are consecutive prime numbers.

15. D4W, G5T, K9P, ?, S23H, V37E [RRB NTPC 02/02/2021 (Evening)]

Correct Answer: (d) O14L
Solution:

Logic: Next number = sum of previous two numbers 1st and 3rd letters are opposite to each other.
Missing number = (9 + 5) = 14
So, option ‘d’ satisfy according to the logic.

16. 2, 10, 30, 68 ,? , 222 [RRB NTPC 03/02/2021 (Morning)]

Correct Answer: (c) 130
Solution:

17. Identify the number that does NOT belong to the following series. [RRB NTPC 03/02/2021 (Morning)]

10, 14, 28, 32, 64, 68, 132

Correct Answer: (d) 132
Solution:

10 + 4 = 14
14 × 2 = 28
28 + 4 = 32
32 × 2 = 64
64 + 4 = 68
68 × 2 ≠132

18. ACE, GIJ, LPO, PXT, ?? [RRB NTPC 03/02/2021 (Morning) ]

Correct Answer: (a) SGY
Solution:

1st alphabet + 6 = 1st alphabet of next + 5 = 1st alphabet of next and so on
2nd alphabet + 6 = 2nd alphabet of next + 7 = 2nd alphabet of next and so on
3rd alphabet + 5 = 3rd alphabet of next
Next term
= P + 3 = S, X + 9 = G, T + 5 = Y ⇒ SGY

19. O2F, R5H, U10J, X17L, ? [RRB NTPC 03/02/2021 (Morning)]

Correct Answer: (d) A26N
Solution:

O + 3 = R, R + 3 = U, U + 3 = X, X + 3 = A
2 + 3 = 5, 5 + 5 = 10 , 10 + 7 = 17, 17 + 9 = 26
F + 2 = H, H + 2 = J, J + 2 = L, L + 2 = N
Next term = A26N

20. Identify the number that does NOT belong to the following series- [RRB NTPC 03/02/2021 (Evening)]

289, 306, 340, 389, 459, 544

Correct Answer: (c) 389
Solution: