Series – Railway Reasoning part – 9

Total Questions: 50

31. 3, 8, 18, 33, 53, ? [RRB NTPC 08/02/2021 (Morning)]

Correct Answer: (d) 78
Solution:

Logic -
3 +5 = 8 , 8 + 10 = 18 , 18 + 15 = 33 , 33 + 20 = 53
Similarly , 53 + 25 = 78

32. 2, 7, 22, 67, ? [RRB NTPC 08/02/2021 (Morning)]

Correct Answer: (a) 202
Solution:

Logic -
2 × 3 + 1 = 7
7 ×3 + 1 = 22
22 × 3 + 1 = 67
67 × 3 + 1 = 202

33. S-81, Q-64, ? , M-36, K-25 [RRB NTPC 08/02/2021 (Evening)]

Correct Answer: (a) O-49
Solution:

S - 2 = Q, Q - 2 = O, O - 2 = M, M - 2 = K
And squares of numbers in decreasing order.

34. 16, 2, 32, 3, 96, 4, ? [RRB NTPC 09/02/2021 (Morning)]

Correct Answer: (d) 384
Solution:

35. Select the term that does NOT belong to the following series. [RRB NTPC 09/02/2021 (Morning)]

3DT, 7GS, 11PS, 15MQ, 19PP

Correct Answer: (c) 11PS
Solution:

36. Q, 18, S, 16, U, 13, W, ? [RRB NTPC 09/02/2021 (Evening)]

Correct Answer: (c) 9
Solution:

37. DKM, FJP, HIS, JHV, ? [RRB NTPC 09/02/2021 (Evening)]

Correct Answer: (d) LGY
Solution:

38. 5A, 7C, 6E, 8G, ?, 9K , 8M [RRB NTPC 10/02/2021 (Morning)]

Correct Answer: (d) 7I
Solution:

39. 2, 3, 7,16, 32,? [RRB NTPC 10/02/2021 (Morning)]

Correct Answer: (b) 57
Solution:

2 + 1² = 3 , 3 + 2² = 7 , 7 + 3² = 16
16 + 4² = 32 , 32 + 5² = 57

40. 234, 197, 160, ?, 86, 49 [RRB NTPC 10/02/2021 (Evening)]

Correct Answer: (c) 123
Solution:

234 - 37 = 197
197 - 37 = 160
160 - 37 = 123
123 - 37 = 86
86 - 37 = 49
So that , ? = 123