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CA Foundation Number Series, Coding and Decoding — practice questions — page 3

Explore 67 free Number Series, Coding and Decoding questions in CA Foundation Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.

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Number Series, Coding and Decoding questions and exercises with answers

Showing questions 61–67 of 67.

A natural number greater than 1 that is not prime is called what?Read the answer and worked solution →Which of these numbers is prime?Read the answer and worked solution →A triangle has 5 dots on each side in a triangular dot pattern. How many dots in all?Read the answer and worked solution →What is the smallest perfect square greater than 200?Read the answer and worked solution →What is the square root of 784?Read the answer and worked solution →In 0, 1, 1, 2, 3, 5, 8, how is each later term formed?Read the answer and worked solution →The series 7, 14, 21, 28 is which type?Read the answer and worked solution →

Worked practice questions

A natural number greater than 1 that is not prime is called what?

  1. Composite
  2. Triangular
  3. Perfect
  4. Rational
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Correct answer: A. Composite

A number greater than 1 with a factorisation into smaller natural numbers is called composite.

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Which of these numbers is prime?

  1. 41
  2. 21
  3. 27
  4. 39
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Correct answer: A. 41

21, 27 and 39 are divisible by 3, while 41 has no divisor other than 1 and itself.

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A triangle has 5 dots on each side in a triangular dot pattern. How many dots in all?

  1. 10
  2. 15
  3. 25
  4. 20
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Correct answer: B. 15

Rows hold 1, 2, 3, 4 and 5 dots, and 1+2+3+4+5 = 15.

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More Quantitative Aptitude topics

Time Value of MoneyProbabilityPermutations and CombinationsCorrelation and RegressionRatio and Proportion, Indices and LogarithmsSets, Relations and FunctionsMeasures of Central Tendency and DispersionStatistical Representation of Data and Sampling