Alphanumeric Series – Railway Reasoning (Part- 4)

Total Questions: 50

41. In the following series, how many times is the number 0 immediately followed by number 2? [RRB NTPC 09/01/2021 (Morning)]

2 1 3 2 5 0 2 7 8 0 2 0 3 4 5 2 0 2 0 7 8

Correct Answer: (d) 3
Solution:

In the series, the number 0 is immediately followed by number 2, 3 times.

42. How many odd numbers are preceded by the number 4 in the following series? [RRB NTPC 10/01/2021 (Evening)]

2 6 6 3 4 5 2 4 9 8 6 4 3 4 8 2

Correct Answer: (b) 2
Solution:

2 6 6 3 4 5 2 4 9 8 6 4 3 4 8 2
From the given series it can be seen that 2 odd numbers are preceded by the number 4.

43. In the following series, how many times is the number 8 NOT followed by the number 4 but is preceded by the number 5? [RRB NTPC 11/01/2021 (Evening)]

6 5 8 2 3 5 8 1 2 5 8 3 4 3 5 6 5 4 5 8 6 5 8 4 5 8

Correct Answer: (d) 5
Solution:

From the above series we can observe that 8 comes 5 times in series in which 8 is not followed by the number 4.

44. 9 B Q = 5 R $ J @ 4* P & 9 M X # G [RRB NTPC 12/01/2021 (Morning)]

Which of the given options is exactly midway between B and X?

Correct Answer: (b) @
Solution:

As we observe the given series we find that @ is exactly between the B and X.

45. How many such digits are there in the following sequence, each of which is immediately preceded by as well as immediately followed by a letter? [RRB NTPC 18/01/2021 (Evening)]

A B 7 C D 9 Z Y * P 2 M © K S 3 ↑  5 N T

Correct Answer: (d) Three
Solution:

A B 7 C D 9 Z Y * P 2 M © K S 3 ↑ 5 N T
In the above sequence, the number of digits, each of which is immediately preceded by as well as immediately followed by a letter is = 3

46. In the following series, how many times is 5 immediately preceded by 6 but NOT followed by 9 ? [RRB NTPC 23/01/2021 (Evening)]

8976597365432887776596546598765

Correct Answer: (d) 3
Solution:

According to the question, we have
Three times 5 immediately preceded by 6 but NOT followed by 9.
That is 654,654,65

47. If all the numbers are dropped from the given arrangement, which of the following will be the ninth to the left of S? [RRB NTPC 27/01/2021 (Evening)]

2 R Q 4 A 5 $ I ^ 9 R # E % 8 S * P

Correct Answer: (c) Q
Solution:

If all numbers are dropped the new arrangement will be
R Q A $ I ^ R # E % S * P
9th to the left of S = Q

48. How many times does 4 appear in the following sequence , where it is neither preceded by 6 nor immediately followed by 9? [RRB NTPC 29/01/2021 (Morning)]

9 4 6 6 4 9 5 9 4 7 8 9 1 6 4 9 6 4 9

Correct Answer: (c) Two
Solution: The number of times 4 appears where it is neither preceded by 6 nor immediately followed by 9 = 2

49. If the following series is written in the reverse order, then which character will be 6th to the right of the 15th character from the right end? [RRB NTPC 01/02/2021 (Morning)]

4 + R P q -T & V % f 3 G A B S

Correct Answer: (d) V
Solution:

Reverse order
= S B A G 3 f % V & T - q P R + 4
6th to the right of the 15th character from the right end = V

50. Select the letter from among the given options that can replace the question mark (?) in the following series. H3K9N15Q21 ? [RRB NTPC 01/02/2021 (Evening)]

Correct Answer: (a) T
Solution:

H + 3 = K, K + 3 = N, N + 3 = Q, Q + 3 = T