Sequence Based Questions in Logical Reasoning

Logical Reasoning is an enormous section. With the increasing complexity of questions, it shouldn’t be taken lightly. In this post, we will be discussing about sequence based questions in Logical reasoning, which is one of the most-scoring question type in the reasoning section.

Sequence based Questions: Types

  • Numerical based: This type of question will contain a set of numbers and some operations are to be performed based on the question(s)
  • Alphabet based: This type of question will contain a set of words and some operations are to be performed based on the question(s)

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Solving Sequence based questions: Prerequisites

The only requirement for solving this kind of questions correctly is attentiveness. This is because this topic only requires a quick understanding of terms like right, left, middle, ascending, descending, etc and a few easy calculations. Let us check some questions based on this topic to understand them better.

Practice Questions for Sequence based questions

Questions 1 to 3: Study the following sets of numbers and carefully answer the questions

384       475       563       728       849       631

1. If in each number all the digits are arranged in descending order, which among the following corresponds to the smallest number?

(a) 563

(b) 631

(c) 728

(d) 475

(e) 384

Answer key: b

Solution:

On arranging each number in descending order, we get:

843       754       653       872       984       631

So the lowest number is 631.

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2. If in each number, first and last digits are interchanged then how many odd numbers are there after interchanging?

(a) four

(b) one

(c) two

(d) three

(e) five

Answer key: d

Solution:

On interchanging first and last digits, we get:

483       574       365       827       948       136

Now there are three odd numbers (483, 365, 827)

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3. If 384 is written as 438, 475 as 547 and so on, then which of the following two numbers will have the least difference?

(a) 475 and 384

(b) 631 and 728

(c) 631 and 849

(d) 728 and 849

(e) 475 and 563

Answer key: a

Solution:

On rearranging all the sets, numbers will be:

438       547       356       872       984       163

547 – 438 = 109

872 – 163 = 709

984 – 163 = 821

984 – 872 = 112

547 – 356 = 191

Now the difference between 547 and 438 (i.e. 475 and 384) is 109 that is the least.

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Questions 4 to 6: Study the following sets of numbers and carefully answer the questions

RAM         SIT        NET        PET        CUT

(Note: The words formed after performing the given operations may or may not be a meaningful English word.)

4. If in each of the words, the first and second letters are interchanged and then all the words are arranged in alphabetical order from left to right, then which word would be in the middle?

(a) RAM

(b) SIT

(c) PET

(d) NET

(e) CUT

Answer key: c

Solution:

RAM       SIT          NET        PET        CUT

If in each of the words, the first and second letters are interchanged, words would be

ARM       IST          ENT        EPT        UCT

Arranging in alphabetical order;

ARM       ENT        EPT        IST          UCT

Thus EPT(which correspond to the word PET) is in the middle

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5. If the first alphabet in each of the word is changed to the previous alphabet in English alphabetical order, how many words thus formed have more than one vowel?

(a) five

(b) one

(c) two

(d) three

(e) four

Answer key: b

Solution:

RAM       SIT          NET        PET        CUT

If the first alphabet in each of the word is changed to the previous alphabet

QAM       RIT          MET        OET        BUT

Thus only OET has 2 vowels.

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6. If the last alphabet in each of the word is changed to the next alphabet in English alphabetical order, how many words thus formed will be meaningful English words?

(a) four

(b) five

(c) two

(d) three

(e) one

Answer key: e

Solution:

RAM       SIT          NET        PET        CUT

If the last alphabet in each of the word is changed to the next alphabet

RAN        SIU         NEU       PEU        CUU

Thus only RAN is a meaningful word.

Practicing more and more sequence based questions is the key for boosting up your speed. All the best for your examination!

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