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RRB Group D Number Series — practice questions — page 2

Explore 42 free Number Series questions in RRB Group D Reasoning. Open each question or exercise to read its content, reference answers and available explanation.

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Number Series questions and exercises with answers

Showing questions 31–42 of 42.

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

Order the steps: crack a number series

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Steps
  1. Write the terms out in order
  2. Take the difference between each pair of neighbours
  3. If those differences are constant, the rule is addition
  4. If not, divide each term by the one before it
  5. If those ratios are constant, the rule is multiplication
  6. Apply the rule once more to get the next term
Difference first, ratio second, then extend. Source: syllabus Maths, Ch 9 Sequences and Series.

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True or false: geometric progressions

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Questions
  1. Statement is true
    Yes
    Statement
    In a GP the ratio of consecutive terms is constant.
  2. Statement is true
    No
    Statement
    In a GP the difference of consecutive terms is constant.
  3. Statement is true
    Yes
    Statement
    The constant ratio in a GP is called the common ratio.
  4. Statement is true
    Yes
    Statement
    The nth term of a GP is a times r to the power n minus one.
  5. Statement is true
    Yes
    Statement
    A GP's first term is usually written a.
The GP definitions, stated straight or bent. Source: syllabus Maths, Ch 9 Sequences and Series.

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Finding a term

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Questions
  1. Question
    A GP starts at 3 with common ratio 2. Its third term is
    Choices
    1. 6
    2. 12
    3. 8
    Correct choice
    12
  2. Question
    Its fourth term is
    Choices
    1. 18
    2. 16
    3. 24
    Correct choice
    24
  3. Question
    A sequence 5, 10, 20, 40 has common ratio
    Choices
    1. 2
    2. 5
    3. 10
    Correct choice
    2
  4. Question
    The term after 40 is
    Choices
    1. 60
    2. 80
    3. 45
    Correct choice
    80
Once the rule is named, extending is mechanical. Source: syllabus Maths, Ch 9 Sequences and Series.

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