Series – Railway Reasoning part – 8

Total Questions: 50

41. T, P, L, H,? [RRB NTPC 29/01/2021 (Morning)]

Correct Answer: (b) D
Solution:

Logic : Letter - 4 = Next Letter
T - 4 = P, P - 4 = L, L - 4 = H, H - 4 = D

42. E, F, H, K, ? [RRB NTPC 29/01/2021 (Morning)]

Correct Answer: (b) O
Solution:

E + 1 = F, F + 2 = H, H + 3 = K, K + 4 = O

43. AD, DH, GL, JP, ? [RRB NTPC 29/01/2021 (Morning)]

Correct Answer: (d) MT
Solution:

44. Select the combination of letters that when sequentially placed in the blank will create a repetitive pattern. [RRB NTPC 29/01/2021 (Morning)]

jj__ __k__j___ ____ kkk

Correct Answer: (a) jkkjj
Solution:

The repeated pattern is: j j j k k k
So, the missing letters are: jkkjj

45. Identify the number that does NOT belong in the following series. [RRB NTPC 29/01/2021 (Evening)]

5, 10, 17, 28, 42, 58, 77

Correct Answer: (a) 42
Solution:

5 + 5 = 10, 10 + 7 = 17,
17 + 11 = 28, 28 + 13 ≠ 42
28 + 13 = 41, 41 + 17 = 58, 58 + 19 = 77

46. 8, 24, 48, 120, 168, ? [RRB NTPC 30/01/2021 (Morning)]

Correct Answer: (a) 288
Solution:

3² − 1 = 8, 5² − 1 = 24
7² − 1 = 48, 11² − 1 = 120
13² − 1 = 168, 17² − 1 = 288

47. D, I, N, S, ? [RRB NTPC 30/01/2021 (Morning)]

Correct Answer: (d) X
Solution:

D + 5 = I, I + 5 = N, N + 5 = S, S + 5 = X

48. Select the combination of letters that when sequentially placed in the blanks will create a repetitive pattern. [RRB NTPC 30/01/2021 (Morning)]

abb _ a _ b _ _ bbb

Correct Answer: (b) bbba
Solution:

Once a and three times bbb is repeated.
abb b /a b b b / a bbb

49. 0, 24, 120, 336, ? [RRB NTPC 30/01/2021 (Morning)]

Correct Answer: (d) 720
Solution:

1³ − 1 = 0
3³ − 3 = 24
5³ − 5 = 120
7³ − 7 = 336
9³ − 9 = 720

50. 126, 65, ?, 9, 2 [RRB NTPC 30/01/2021 (Evening)]

Correct Answer: (a) 28
Solution: