Classification Questions and Answers

Q: Choose the word which is different from the other words in the group.

The odd one out is Brass.Copper, tin and platinum are metallic elements. Brass is an alloy, a mixture of copper and zinc.Grouping by other features does not single out one word: copper and brass are both reddish-yellow, and tin and platinum are both white metals, so the element-versus-alloy distinction is the one that separates exactly one item.

Q: Which one of the following groups of letters is the odd one out?

The odd one out is HJKN.The other three groups follow the gaps +2, +1, +2 between letters: C(+2)E(+1)F(+2)H, P(+2)R(+1)S(+2)U and U(+2)W(+1)X(+2)Z.In HJKN the gaps are H(+2)J(+1)K(+3)N: the last step is 3 instead of 2, so it breaks the pattern.

Q: Which of the following does not belong to the group ?

The group that does not belong is PRSU.In each of the other groups the letters advance by two places every time:A C E G: A +2 C +2 E +2 GG I K M: G +2 I +2 K +2 MM O Q S: M +2 O +2 Q +2 SIn P R S U the steps are +2, +1, +2: R to S is only one place. Following the pattern it should have been P R T V. So PRSU breaks the rule shared by the other three.

Q: Choose the group of letters which is different from others.

The odd group is MQU.Write each letter's position in the alphabet:DGJ: 4, 7, 10 (steps of +3)HKN: 8, 11, 14 (steps of +3)TWZ: 20, 23, 26 (steps of +3)MQU: 13, 17, 21 (steps of +4)Three groups move forward by three letters each time; only MQU moves by four, so it is different.

Q: Choose the number pair which is different from others.

The odd pair is 5 : 115.In each pair the second number is \(n^3 - n\), where \(n\) is the first number:\[ \begin{aligned} 4^3 - 4 &= 64 - 4 = 60 \\ 6^3 - 6 &= 216 - 6 = 210 \\ 7^3 - 7 &= 343 - 7 = 336 \\ 5^3 - 5 &= 125 - 5 = 120 \end{aligned} \]The pattern needs 5 : 120, so 5 : 115 is the pair that breaks it.

Q: Identify the odd word from the group of words given below relating to 'tobacco'.

The odd word is Addiction.Subtraction, division and equation are all terms of arithmetic and mathematics. Addiction stands apart: it is the dependence that tobacco causes, through nicotine, which makes it the word in the group that relates to tobacco.The word also plays on 'addition', which would have fitted with the other three. Recognising the near-pun is the point of the question.

Q: Sopt the odd one out :

The odd one out (the paper prints 'Sopt') is Zomato.Ola, Uber and Meru are all ride-hailing or cab services: Ola and Uber are app-based aggregators that connect passengers with drivers, and Meru is a radio-taxi company that later moved to app booking. Zomato is a restaurant discovery and food delivery platform, so it is the only one not in the transport business.All four are digital platforms, so the grouping cannot be by technology; it has to be by the service they offer, and on that basis Ola, Uber and Meru belong together while Zomato stands apart.

Q: Find the odd letters pair from the following

The odd one is ORQP.In each of the other three, a first letter is followed by three consecutive letters in forward order: A, then J K L; I, then B C D; U, then F G H. The first letters are all vowels.ORQP also starts with a vowel, but its last three letters R, Q, P run backwards. That breaks the forward sequence shared by AJKL, IBCD and UFGH, so it is the odd one out.

Q: Find the odd number pair from the given responses

The odd pair is 16 : 64.In three of the pairs the second number is three times the first: \(81 \times 3 = 243\), \(64 \times 3 = 192\) and \(25 \times 3 = 75\). In 16 : 64 the second number is four times the first.So 16 : 64 breaks the rule shared by the others.In odd-one-out questions on number pairs, first look for a single operation that turns the first number into the second in most of the pairs; the pair that does not fit that operation is the answer.

Important Instructions

81.

Choose the word which is different from the other words in the group.

A.Copper
B.Tin
C.Brass
D.Platinum

Exam Year(s)

Haryana Civil Services - 2026, HPSC - 2026,

Answer: C

The odd one out is Brass.

Copper, tin and platinum are metallic elements. Brass is an alloy, a mixture of copper and zinc.

Grouping by other features does not single out one word: copper and brass are both reddish-yellow, and tin and platinum are both white metals, so the element-versus-alloy distinction is the one that separates exactly one item.

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82.

Which one of the following groups of letters is the odd one out?

A.CEFH
B.HJKN
C.PRSU
D.UWXZ

Exam Year(s)

MPPSC State Service - 2018,

Answer: B

The odd one out is HJKN.

The other three groups follow the gaps +2, +1, +2 between letters: C(+2)E(+1)F(+2)H, P(+2)R(+1)S(+2)U and U(+2)W(+1)X(+2)Z.

In HJKN the gaps are H(+2)J(+1)K(+3)N: the last step is 3 instead of 2, so it breaks the pattern.

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83.

Which of the following does not belong to the group ?

A.ACEG
B.GIKM
C.PRSU
D.MOQS

Exam Year(s)

Punjab Civil Service - 2018,

Answer: C

The group that does not belong is PRSU.

In each of the other groups the letters advance by two places every time:

A C E G: A +2 C +2 E +2 G
G I K M: G +2 I +2 K +2 M
M O Q S: M +2 O +2 Q +2 S

In P R S U the steps are +2, +1, +2: R to S is only one place. Following the pattern it should have been P R T V. So PRSU breaks the rule shared by the other three.

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84.

Choose the group of letters which is different from others.

A.DGJ
B.HKN
C.MQU
D.TWZ

Exam Year(s)

RSMSSB - 2026, RSMSSB Mahila Supervisor - 2026,

Answer: C

The odd group is MQU.

Write each letter's position in the alphabet:

DGJ: 4, 7, 10 (steps of +3)
HKN: 8, 11, 14 (steps of +3)
TWZ: 20, 23, 26 (steps of +3)
MQU: 13, 17, 21 (steps of +4)

Three groups move forward by three letters each time; only MQU moves by four, so it is different.

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85.

Choose the number pair which is different from others.

A.4 : 60
B.5 : 115
C.6 : 210
D.7 : 336

Exam Year(s)

RSMSSB - 2026, RSMSSB Mahila Supervisor - 2026,

Answer: B

The odd pair is 5 : 115.

In each pair the second number is \(n^3 - n\), where \(n\) is the first number:

\[ \begin{aligned} 4^3 - 4 &= 64 - 4 = 60 \\ 6^3 - 6 &= 216 - 6 = 210 \\ 7^3 - 7 &= 343 - 7 = 336 \\ 5^3 - 5 &= 125 - 5 = 120 \end{aligned} \]

The pattern needs 5 : 120, so 5 : 115 is the pair that breaks it.

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86.

Identify the odd word from the group of words given below relating to 'tobacco'.

A.Addiction
B.Subtraction
C.Division
D.Equation

Exam Year(s)

RSMSSB - 2024, RSMSSB Mahila Supervisor - 2024,

Answer: A

The odd word is Addiction.

Subtraction, division and equation are all terms of arithmetic and mathematics. Addiction stands apart: it is the dependence that tobacco causes, through nicotine, which makes it the word in the group that relates to tobacco.

The word also plays on 'addition', which would have fitted with the other three. Recognising the near-pun is the point of the question.

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87.

Sopt the odd one out :

A.Zomato
B.Ola
C.Uber
D.Meru

Exam Year(s)

MH SET - 2018, SET Exam - 2018,

Answer: A

The odd one out (the paper prints 'Sopt') is Zomato.

Ola, Uber and Meru are all ride-hailing or cab services: Ola and Uber are app-based aggregators that connect passengers with drivers, and Meru is a radio-taxi company that later moved to app booking. Zomato is a restaurant discovery and food delivery platform, so it is the only one not in the transport business.

All four are digital platforms, so the grouping cannot be by technology; it has to be by the service they offer, and on that basis Ola, Uber and Meru belong together while Zomato stands apart.

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88.

Pick the odd one from

CGKO : BFJN : AEIM : FDKN

A.CGKO
B.BFJN
C.AEIM
D.FDKN

Exam Year(s)

TNPSC Group 1 - 2025, TNPSC - 2025,

Answer: D

In CGKO, BFJN and AEIM each letter is 4 places after the one before, so these three follow one rule.

In FDKN the letters do not follow the same step of 4 (F to D goes backwards by 2), so FDKN is the odd one, option D.

The pattern CGKO, BFJN, AEIM keeps the same gaps between letters in each word, while FDKN has gaps of minus 2, plus 7 and plus 3.

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89.

Find the odd letters pair from the following

A.AJKL
B.IBCD
C.ORQP
D.UFGH

Exam Year(s)

Tripura Public Service Commission - 2026,

Answer: C

The odd one is ORQP.

In each of the other three, a first letter is followed by three consecutive letters in forward order: A, then J K L; I, then B C D; U, then F G H. The first letters are all vowels.

ORQP also starts with a vowel, but its last three letters R, Q, P run backwards. That breaks the forward sequence shared by AJKL, IBCD and UFGH, so it is the odd one out.

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90.

Find the odd number pair from the given responses

A.81 : 243
B.16 : 64
C.64 : 192
D.25 : 75.

Exam Year(s)

Tripura Public Service Commission - 2025,

Answer: B

The odd pair is 16 : 64.

In three of the pairs the second number is three times the first: \(81 \times 3 = 243\), \(64 \times 3 = 192\) and \(25 \times 3 = 75\). In 16 : 64 the second number is four times the first.

So 16 : 64 breaks the rule shared by the others.

In odd-one-out questions on number pairs, first look for a single operation that turns the first number into the second in most of the pairs; the pair that does not fit that operation is the answer.

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