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RRB NTPC Number Series — practice questions

Explore 61 free Number Series questions in RRB NTPC 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 1–30 of 61.

In an AP, which quantity stays constant?Read the answer and worked solution →The fixed gap between successive terms of an arithmetic progression is named what?Read the answer and worked solution →The sum of the terms of a finite arithmetic progression is called what?Read the answer and worked solution →Find the 7th term of the series that starts 5, 9, 13, 17 and continues the same way.Read the answer and worked solution →Which number fills the blank in 3, 8, 13, __, 23, 28?Read the answer and worked solution →What is the sum of 2 + 5 + 8 + 11 + 14?Read the answer and worked solution →By pairing numbers from both ends, what is 1 + 2 + 3 + ... + 100?Read the answer and worked solution →A four-term series starts at 7 and drops by 3 each step. What is the last term?Read the answer and worked solution →Three numbers 10, x, 30 are in arithmetic progression. What is x?Read the answer and worked solution →What is the sum of the four numbers 6, 10, 14 and 18?Read the answer and worked solution →How is a geometric progression term formed from the last?Read the answer and worked solution →What is the common ratio of the sequence 2, 6, 18, 54?Read the answer and worked solution →What term follows 2, 6, 18, 54 in the same pattern?Read the answer and worked solution →Which number comes next in 64, 32, 16, 8, ...?Read the answer and worked solution →Find the 6th term of the series that runs 3, 6, 12, 24 and so on.Read the answer and worked solution →What happens to the signs of terms when the common ratio is negative?Read the answer and worked solution →A progression whose terms alternate in sign is described as what kind of sequence?Read the answer and worked solution →If the common ratio is below 1 in size, the terms do what?Read the answer and worked solution →Geometric progressions show exponential change, while arithmetic ones show what?Read the answer and worked solution →How is each Fibonacci number formed?Read the answer and worked solution →Which number follows 13, 21, 34, 55 in the Fibonacci pattern?Read the answer and worked solution →Fill the blank in the Fibonacci run 1, 1, 2, 3, 5, __, 13.Read the answer and worked solution →In the Fibonacci run ..., 55, 89, ..., what is the term after 89?Read the answer and worked solution →What comes next in 5, 15, 45, 135, ...?Read the answer and worked solution →Which term follows in the run 100, 90, 80, 70, ...?Read the answer and worked solution →A run starts 1, 2 and each term is the sum of the previous two. What is the 6th term?Read the answer and worked solution →A counter shows 1, 4, 9, 16, 25 in turn. What will it show next?Read the answer and worked solution →The series 1, 8, 27, 64 lists perfect cubes. Which cube follows?Read the answer and worked solution →Every term is the sum of the previous two: 1, 1, 2, 3, 5, 8, 13. Next?Read the answer and worked solution →Dots form triangles with 1, 3, 6, 10, 15 dots. How many dots in the next?Read the answer and worked solution →

Worked practice questions

In an AP, which quantity stays constant?

  1. Ratio of consecutive terms
  2. Gap between consecutive terms
  3. Product of consecutive terms
  4. Sum of consecutive terms
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Correct answer: B. Gap between consecutive terms

Each term differs from the one before it by the same fixed amount, called the common difference.

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The fixed gap between successive terms of an arithmetic progression is named what?

  1. Common ratio
  2. Common multiple
  3. Common difference
  4. Common factor
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Correct answer: C. Common difference

The constant gap between neighbouring terms of such a progression is called its common difference.

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The sum of the terms of a finite arithmetic progression is called what?

  1. An arithmetic mean
  2. An arithmetic product
  3. An arithmetic ratio
  4. An arithmetic series
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Correct answer: D. An arithmetic series

Adding up the members of a finite arithmetic progression gives what is termed an arithmetic series.

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