Series – Railway Reasoning part – 8

Total Questions: 50

31. G7H, I9J, K11L, ? [RRB NTPC 27/01/2021 (Morning)]

Correct Answer: (c) M13N
Solution:

the number in the middle of two alphabets is the positional value of the letter written on its left side.

32. PE₁₁, QD₂, RC₉, SB₄, ? [RRB NTPC 27/01/2021 (Evening)]

Correct Answer: (b) TA₇
Solution:

33. XII, V, X, ?, VIII, CXXV [RRB NTPC 27/01/2021 (Evening)]

Correct Answer: (c) XXV
Solution:

Decoding Roman numeral into decimal system 12, 5, 10, ___ , 8, 125
There are two series one is of -2 and other is of × 5
So, 5 × 5 = 25 and 25 in roman is XXV.

34. 6, 44, 9, 42, ?, 40 [RRB NTPC 27/01/2021 (Evening)]

Correct Answer: (c) 12
Solution:

6 + 3 = 9,
44 - 2 = 42
9 + 3 = 12
42 - 2 = 40

35. Find the missing letter/series to complete the following sequence: [RRB NTPC 27/01/2021 (Evening)]

Correct Answer: (b) 4
Solution:

36. 26A2, 4E6, 8I10, 14O16, ? [RRB NTPC 28/01/2021 (Morning) ]

Correct Answer: (b) 20U22
Solution:

Logic - consecutive alphabet
26 A 2 = Z A B , 4 E 6 = D E F , 8 I 10 = 8 9 10 , 14 O 16 = N O P
Similarly , 20U22 = TUV

37. Select the letter that when placed in the blank of the given series will complete the series. [ RRB NTPC 28/01/2021 (Morning)]

MNO, PQR, STU, V_X

Correct Answer: (c) W
Solution:

Logic - Given this series in alphabetical order.
M + 1 = N , N + 1 = O
P + 1 = Q , Q + 1 = R
S + 1 = T , T + 1 = U
V + 1 = W , W + 1 = X

38. Identify the number from the given options that does NOT belong to the following series. [RRB NTPC 28/01/2021 (Evening)]

3, 7, 17, 31, 59

Correct Answer: (a) 59
Solution:

Here is the gap of prime numbers. The following pattern will be
followed with consecutive numbers.
1 prime number between 3 and 7
2 prime numbers between 7 and 17
3 prime numbers between 17 and 31
4 prime numbers between 31 and 53
So, 59 is the incorrect option.

39. D3K, E5J, F7I, G11H, ? [RRB NTPC 28/01/2021 (Evening)]

Correct Answer: (c) H13G
Solution:

Logic →
D + 1 = E , E + 1 = F , F + 1 = G , G + 1 = H
3 , 5 ,7 ,11 and 13 are prime numbers .
And K - 1 = J , J - 1 = I, I - 1 = H , H - 1 = G

40. P3L, N5N, L7P, J11R,H13T, ? [RRB NTPC 29/01/2021 (Morning)]

Correct Answer: (b) F17 V
Solution:

For 1st Letter: P - 2 = N, N - 2 = L, L - 2 = J, J - 2 = H, H - 2 = F
For Middle Number: Consecutive Prime
Numbers → 3, 5, 7, 11, 13, 17
For last Letter: L + 2 = N, N + 2 = P, P + 2 = R, R + 2 = T, T + 2 = V