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IBPS RRB Series Coding Relations — practice questions — page 3

Explore 76 free Series Coding Relations questions in IBPS RRB Reasoning. Open each question or exercise to read its content, reference answers and available explanation.

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Series Coding Relations questions and exercises with answers

Showing questions 61–76 of 76.

Over ten generations, a person's ancestors sum to 2046, computed using the sum formula of a:Read the answer and worked solution →The geometric mean of two positive numbers a and b is:Read the answer and worked solution →Inserting three numbers between 1 and 256 to form a G.P. gives r to the fourth equal to:Read the answer and worked solution →Between 1 and 256 the real values of r that work are:Read the answer and worked solution →If A and G are the A.M. and G.M. of two positive numbers, which is never smaller?Read the answer and worked solution →30 bacteria double every hour. After 2 hours there are:Read the answer and worked solution →Rs 500 deposited at 10 percent compounded annually grows each year by a constant ratio of:Read the answer and worked solution →Inserting two numbers between 3 and 81 so the sequence is a G.P. gives:Read the answer and worked solution →Catch the G.P.sRead the answer and worked solution →Pop the sequence makersRead the answer and worked solution →Steer into the G.P. laneRead the answer and worked solution →Slice the G.P. wordsRead the answer and worked solution →A.M. or G.M.Read the answer and worked solution →Which notation letterRead the answer and worked solution →Type the answerRead the answer and worked solution →G.P. bingoRead the answer and worked solution →

Worked practice questions

Over ten generations, a person's ancestors sum to 2046, computed using the sum formula of a:

  1. Geometric progression
  2. Arithmetic progression
  3. Fibonacci sequence
  4. List of prime numbers
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Correct answer: A. Geometric progression

1. 2, 4, 8 and so on double each time. 2. Doubling means a constant ratio. 3. So the G.P. sum formula gives 2046. _Source: syllabus Mathematics, Chapter 8, Sequences and Series._

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The geometric mean of two positive numbers a and b is:

  1. The product ab itself
  2. Square root of ab
  3. Half of a plus b
  4. The difference a minus b
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Correct answer: B. Square root of ab

1. For 2 and 8 the mean is 4. 2. 4 is the square root of 16, their product. 3. So the geometric mean is the square root of ab. _Source: syllabus Mathematics, Chapter 8, Sequences and Series._

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Inserting three numbers between 1 and 256 to form a G.P. gives r to the fourth equal to:

  1. 16 exactly
  2. 4 exactly
  3. 256 exactly
  4. 64 exactly
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Correct answer: C. 256 exactly

1. 256 becomes the fifth term. 2. The fifth term is a times r to the fourth with a equal to 1. 3. So r to the fourth is 256. _Source: syllabus Mathematics, Chapter 8, Sequences and Series._

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More Reasoning topics

Distance and DirectionAnalogiesAnalogyNumber SeriesBlood RelationsCoding DecodingNumber Series, Coding and Decoding and Odd Man OutInequalities