Odd One Out – Railway Reasoning

Total Questions: 50

21. Which one of the following does NOT belong to the given set? [NTPC CBT – I (19/01/2021 Morning)]

{3/6,  5/10,  9/18,  ………}

Correct Answer: (b) 42/86
Solution:

3/6, 5/10, 9/18,
—————————————
All fraction are in the form of 1/2
So, 42/86 is the answer (as it is not in the form of 1/2)

22. Select the option that is different from the rest. [NTPC CBT – I (20/01/2021 Morning)]

Correct Answer: (d)
Solution:

23. Select the one that is different from the rest. [NTPC CBT – I (20/01/2021 Evening)]

Correct Answer: (a) 62/15
Solution:

Denominator × 4 + 1 = Numerator
But in option 1 pattern is not followed.

24. Select the odd one out. [NTPC CBT – I (22/01/2021 Evening)]

118, 146, 182, 226

Correct Answer: (a) 182
Solution:

Numbers are made of (n × 2), where n is a prime number.
118 = 59 × 2 ⇒ 146 = 73 × 2
182 = 91 × 2 (91 is not a prime no)
226 = 113 × 2
Option (a) does not follow the logic.

25. Identify the number from among the given options that belongs to this group: [NTPC CBT – I (23/01/2021 Morning)]

94, 61, 83, ?

Correct Answer: (b) 72
Solution:

94 - 33 = 61
61 + 22 = 83 ⇒ 83 - 11 = 72

26. Select the letter that is different from the other three on the basis of the letter clusters given below: [NTPC CBT – I (25/01/2021 Morning)]

ABCDE FGHIJ KLMNO PQRST UVWXY

Correct Answer: (b) Y
Solution:

Letters ‘H’, ‘M’ and ‘W’ are at 3rd position in the given letter clusters.
But ‘Y’ is at 5th position. Therefore, based on the position of letters, ‘Y’ is different.

27. Select the odd one. [NTPC CBT – I (25/01/2021 Evening)]

Correct Answer: (c) QD
Solution:

(1st letter place value + 2) = Second letter.
VK = 22 + 2 = 11 = K ⇒ LF = 12 + 2 = 6 = F
QD = 17 + 2 = 8.5 = H

28. Select the odd one. [NTPC CBT – I (30/01/2021 Morning)]

CF, OR, VX, AD

Correct Answer: (a) VX
Solution:

Place value difference between these terms = 3
CF = 6 - 3 = 3 ⇒ OR = 18 - 15 = 3
VX = 24 - 22 = 2 ≠ 3 ⇒ AD = 4 - 1 = 3

29. Identify the letter pair that does NOT belong to the following group. [NTPC CBT – I (02/02/2021 Morning)]

Correct Answer: (d) W–A
Solution:

B + 4 = F
W + 4 = A ⇒ M + 4 = Q
T + 4 ≠ Y

30. Find the odd one. [NTPC CBT – I (08/02/2021 Evening)]

Correct Answer: (d) W S O
Solution:

In each letter cluster the difference between place value of previous letter and next letter is the same, but in option (b), it is not the same.