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WB Police Constable Number Series, Coding and Decoding and Odd Man Out — practice questions — page 4

Explore 106 free Number Series, Coding and Decoding and Odd Man Out questions in WB Police Constable Reasoning. Open each question or exercise to read its content, reference answers and available explanation.

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Number Series, Coding and Decoding and Odd Man Out questions and exercises with answers

Showing questions 91–106 of 106.

True or false: sequences and seriesRead the answer and worked solution →Complete the geometric progression ruleRead the answer and worked solution →Spotting the ruleRead the answer and worked solution →Constant difference, or constant ratio?Read the answer and worked solution →Order the steps: crack a number seriesRead the answer and worked solution →True or false: geometric progressionsRead the answer and worked solution →Finding a termRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Tap every sequence with a constant ratioRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Finite or infinite?Read the answer and worked solution →Complete the geometric meanRead the answer and worked solution →True or false: reading a series questionRead the answer and worked solution →

Worked practice questions

True or false: sequences and series

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Questions
  1. Statement is true
    Yes
    Statement
    A sequence arranges numbers in a definite order.
  2. Statement is true
    Yes
    Statement
    A series is formed by adding the terms of a sequence.
  3. Statement is true
    No
    Statement
    A sequence and a series are the same thing.
  4. Statement is true
    Yes
    Statement
    A sequence with finitely many terms is called finite.
  5. Statement is true
    Yes
    Statement
    A sequence that is not finite is called infinite.
The definitions the chapter opens with. Source: syllabus Maths, Ch 9 Sequences and Series.

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Complete the geometric progression rule

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Missing parts
  1. Answer
    ratio
    Choices
    1. ratio
    2. difference
    3. sum
  2. Answer
    ratio
    Choices
    1. ratio
    2. difference
    3. factor
  3. Answer
    1
    Choices
    1. 1
    2. 2
    3. 0
Complete the statement
A sequence is a geometric progression if the {0} of any term to its preceding term is the same throughout. That constant is called the common {1}, and the nth term is given by a·r^(n−{2}).
In a GP the RATIO between neighbours stays fixed, which is the pattern behind many series items. Source: syllabus Maths, Ch 9 Sequences and Series.

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Spotting the rule

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Questions
  1. Question
    2, 6, 18, 54 — each term is the previous one
    Choices
    1. times 3
    2. plus 4
    3. squared
    Correct choice
    times 3
  2. Question
    That makes it a
    Choices
    1. arithmetic progression
    2. geometric progression
    3. random list
    Correct choice
    geometric progression
  3. Question
    Its common ratio is
    Choices
    1. 4
    2. 2
    3. 3
    Correct choice
    3
  4. Question
    The next term after 54 is
    Choices
    1. 162
    2. 108
    3. 58
    Correct choice
    162
Number-series items are solved by naming the rule linking neighbours. Source: syllabus Maths, Ch 9 Sequences and Series.

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More Reasoning topics

Coding DecodingDistance and DirectionNumber SeriesBlood RelationsAnalogyAnalogiesVenn DiagramsDirection Sense