Series – Railway Reasoning part – 7

Total Questions: 50

31. If by a logic 2 = 49 and 8 = 225, then which of the following CANNOT be a value of 12 ? [RRB NTPC 16/01/2021 (Morning)]

Correct Answer: (a) 400
Solution:

Here pattern is
(2+5)² ⇒ 7² = 49
(8+7)² ⇒ 15² = 225
By Applying both the logic below
(12+5)² ⇒ 17² = 289
(12+7)² ⇒ 19² = 361
So the value of 12 can be between 289 and 361
Here , 400 is out of this range .
Here , 400 is the correct answer .

32. CX, FU, IR, ? [RRB NTPC 16/01/2021 (Evening)]

Correct Answer: (c) LO
Solution:

33. 6, 10, 20, 24, 48, 52, (?) [RRB NTPC 16/01/2021 (Evening)]

Correct Answer: (b) 104
Solution:

Two alternate series are given one is of + 4 and the other is of × 2 So, 52 × 2 = 104

34. B, E, H, K, ?, Q [RRB NTPC 17/01/2021 (Morning)]

Correct Answer: (a) N
Solution:

35. C, G, K, O, ?, W [RRB NTPC 17/01/2021 (Morning)]

Correct Answer: (b) S
Solution:

36. 13, 25, 49, 97, ? [RRB NTPC 17/01/2021 (Morning)]

Correct Answer: (d) 193
Solution:

37. ab, fg, jk, mn, ? [RRB NTPC 17/01/2021 (Evening)]

Correct Answer: (a) op
Solution:

38. a, b, d, g, ? [RRB NTPC 17/01/2021 (Evening)]

Correct Answer: (d) k
Solution:

39. Identify the letter-pair from among the given options that expresses a relationship most similar to that expressed in the following letter-pairs. [RRB NTPC 17/01/2021 (Evening)]

yb, ve, tg, ?

Correct Answer: (c) pk
Solution:

Logic : alphabet and their opposite alphabet are written.

40. k11, m13, q17, s19, ? [RRB NTPC 17/01/2021 (Evening)]

Correct Answer: (d) w23
Solution: