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Question 251

RRB NTPC 2026• General Intelligence and Reasoning• General Intelligence and Reasoning

What should come in place of ‘?’ in the given series?

45 ? 63 81 105 135

  1. AOption (a)

    54

  2. BOption (b)

    52

  3. COption (c)

    51

  4. DOption (d)

    53

View answer & explanation

Correct answer

Answer: (c)C.

51

Why this answer is correct

The logic follows here, 

Logic:  The differences are increasing by 6 in each step.

  • 45 + 6 = 51
  • 51 + 12 = 63
  • 63 + 18 = 81
  • 81 + 24 = 105
  • 105 + 30 = 135

The missing number in the series is 51.

Hence, the correct answer is "option 3."

Question 252

RRB NTPC 2026• General Intelligence and Reasoning• General Intelligence and Reasoning

Refer to the following letter series and answer the question. (Counting to be done from left to right only.)

(Left) K D A Z Z X L E L A R A E P E Y U Z F U Q P (Right)

How many such vowels are there, each of which is immediately preceded by a consonant and also immediately followed by a consonant?

  1. AOption (a)

    7

  2. BOption (b)

    8

  3. COption (c)

    6

  4. DOption (d)

    5

View answer & explanation

Correct answer

Answer: (c)C.

6

Why this answer is correct

Given: K D A Z Z X L E L A R A E P E Y U Z F U Q P

Required Condition: Consonant − Vowel − Consonant

(Left) K D A Z Z X L E L A R A E P E Y U Z F U Q P (Right)

There are 6 vowels that are immediately preceded and followed by a consonant: A, E, A, E, U, and U in the segments DAZ, LEL, LAR, PEY, YUZ, and FUQ.

Hence, the correct answer is "Option 3"

Question 253

RRB NTPC 2026• General Intelligence and Reasoning• General Intelligence and Reasoning

In a certain code language, "ZCKU" is coded as "94" and "SAPI" is coded as "126". What is the code for "GXRB" in that given language?

  1. AOption (a)

    119

  2. BOption (b)

    127

  3. COption (c)

    114

  4. DOption (d)

    120

View answer & explanation

Correct answer

Answer: (c)C.

114

Why this answer is correct

The logic follows here, 

Logic: Sum of opposite positional values × 2.

ZCKU

  • Sum of opposite positional values = 1 + 24 + 16 + 6 = 47
  • Code = 47 × 2 = 94

 

SAPI 

  • Sum of opposite positional values = 8 + 26 + 11 + 18 = 63
  • Code = 63 × 2 = 126

 

Applying the same logic GXRB,

  • Sum of opposite positional values = 20 + 3 + 9 + 25 = 57
  • Code = 57 × 2 = 114

 

Hence, the correct answer is “Option 3”.

Question 254

RRB NTPC 2026• General Intelligence and Reasoning• General Intelligence and Reasoning

In a certain code language, 'NHJCR' is coded as '77' and 'QETLO’ is coded as ‘61'. What is the code for 'PHASJ' in the given code language?

  1. AOption (a)

    76

  2. BOption (b)

    70

  3. COption (c)

    55

  4. DOption (d)

    52

View answer & explanation

Correct answer

Answer: (a)A.

76

Why this answer is correct

The logic follows here, 

Logic: Sum of opposite positional values of letters − 5.

For NHJCR, 

  • Sum of reverse positional values = 13 + 19 + 17 + 24 + 9 = 82
  • Code = 82 − 5 = 77

 

For QETLO,

  • Sum of reverse positional values = 10 + 22 + 7 + 15 + 12 = 66
  • Code = 66 − 5 = 61

 

Applying the same logic PHASJ:

  • Sum of reverse positional values = 11 + 19 + 26 + 8 + 17 = 81
  • Code = 81 − 5 = 76

 

Hence, the correct answer is "option 1"

Question 255

RRB NTPC 2026• General Intelligence and Reasoning• General Intelligence and Reasoning

Seven people F, G, H, L, M, O and Q are sitting in a row facing north. No one sits to the right of Q. O sits to the immediate left of Q. Only three people sit between Q and H. F sits third to the left of L. G sits to the immediate right of L. How many people sit between M and O?

  1. AOption (a)

    Two

  2. BOption (b)

    Four

  3. COption (c)

    One

  4. DOption (d)

    Three

View answer & explanation

Correct answer

Answer: (d)D.

Three

Why this answer is correct

Given:  Seven people F, G, H, L, M, O, and Q, are sitting in a row facing north.

  1. No one sits to the right of Q.
  2. O sits to the immediate left of Q.
  3. Only three people sit between Q and H.
  4. F sits third to the left of L.
  5. G sits to the immediate right of L.

The Final Arrangement is, 

The people sitting between them are at the 3rd, 4th, and 5th positions, which are H, L, and G.

Hence, the correct answer is "option 4"

Question 256

RRB NTPC 2026• General Intelligence and Reasoning• General Intelligence and Reasoning

Seven boxes A, B, C, D, E, F and G are kept one over the other but not necessarily in the same order. Only one box is kept above C. A is not the topmost box. Only two boxes are kept below D. G is kept below D but above F. E is kept below A. How many boxes are kept between A and E?

  1. AOption (a)

    None

  2. BOption (b)

    Two

  3. COption (c)

    One

  4. DOption (d)

    Three

View answer & explanation

Correct answer

Answer: (a)A.

None

Why this answer is correct

**Given:**Seven boxes A, B, C, D, E, F and G are kept one over the other but not necessarily in the same order

  1. Only one box is kept above C.
  2. Only two boxes are kept below D.
  3. G is kept below D but above F.
PositionBox
7
6C
5
4
3D
2G
1F
  1. A is not the topmost box.
  2. E is kept below A.

Final Arrangement:

7B
6C
5A
4E
3D
2G
1F

Thus, there are none boxes kept between A and E.

Hence, the correct answer is 'Option 1'.

Question 257

RRB NTPC 2026• General Intelligence and Reasoning• General Intelligence and Reasoning

Each vowel in the word WONDERLANDS is changed to the letter immediately following it in the English alphabetical order AND each consonant is changed to the letter immediately preceding it in the English alphabetical order. Which of the following letters will appear exactly twice in the group of letters thus formed?

  1. AOption (a)

    F

  2. BOption (b)

    M

  3. COption (c)

    Q

  4. DOption (d)

    R

View answer & explanation

Correct answer

Answer: (b)B.

M

Why this answer is correct

Given Word: WONDERLANDS

Applying the logic ,

WONDERLANDS
−1+1−1−1+1−1−1+1−1−1−1
VPMCFQKBMCR

The letters in the group thus formed are: V, P, M, C, F, Q, K, B, M, C, R

The letters that appear exactly twice in the newly formed group are M and C.

Hence, the correct answer is "option 2"

Question 258

RRB NTPC 2026• General Intelligence and Reasoning• General Intelligence and Reasoning

Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which is the one that DOES NOT belong to that group?

(Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)

  1. AOption (a)

    KHN

  2. BOption (b)

    VSX

  3. COption (c)

    NKP

  4. DOption (d)

    ROT

View answer & explanation

Correct answer

Answer: (a)A.

KHN

Why this answer is correct

For VSX

 

For NKP

 

For ROT

 

For KHN

 

Therefore, KHN is the odd one out as it does not follow the common pattern.

Hence, the correct answer is "option 1"

Question 259

RRB NTPC 2026• General Intelligence and Reasoning• General Intelligence and Reasoning

In the following triad, each group of letters is related to the subsequent one following a certain logic. Select, from the given options, the one which follows the same logic.

DENY - DYNE - YNED

HUGE - HEGU - EGUH

  1. AOption (a)

    GROW - GRWO - ROWG

  2. BOption (b)

    LOST - LTSO - TSOL

  3. COption (c)

    CLOT - LCOT - TLOC

  4. DOption (d)

    TURN - TRUN - NRUT

View answer & explanation

Correct answer

Answer: (b)B.

LOST - LTSO - TSOL

Why this answer is correct

The logic follows here, 

For 'DENY - DYNE - YNED',

For 'HUGE - HEGU - EGUH',

Applying the same logic to 'LOST':

Thus, the triad following the logic is 'LOST - LTSO - TSOL'.

Hence, the correct answer is 'Option 2'.

Question 260

RRB NTPC 2026• General Intelligence and Reasoning• General Intelligence and Reasoning

Seven boxes A, B, R, U, P, T and S are kept one over the other but not necessarily in the same order. Only four boxes are kept above U. Only one box is kept above R. Only one box is kept between R and A. S is kept immediately above T. P is kept at someplace below B. How many boxes are kept between B and S?

  1. AOption (a)

    Four

  2. BOption (b)

    One

  3. COption (c)

    Three

  4. DOption (d)

    Two

View answer & explanation

Correct answer

Answer: (a)A.

Four

Why this answer is correct

Given: Seven boxes, A, B, R, U, P, T, and S, are kept one over the other but not necessarily in the same order.

  1. Only four boxes are kept above U.
  2. Only one box is kept above R.
  3. Only one box is kept between R and A.
PositionBox
7
6R
5
4A
3U
2
1
  1. S is kept immediately above T.
  2. P is kept at someplace below B.

Final Arrangement:

7B
6R
5P
4A
3U
2S
1T

Thus, there are four boxes R, P, A, and Ubetween B and S.

Hence, the correct answer is 'Option 1'.