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English and Logical Reasoning Prep GuideLogical ReasoningSeries Completion

Paragraph: This set contains additional number series questions, some of which are in Roman numerals. These items differ from Sets 1,2 , and 3 because they ask you to find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters; for these questions, look for a number series and a letter series. Question: Look at this series: 4, 7, 25, 10, _ _ _ _ , 20, 16, 19,

Options

  1. A13
  2. B15
  3. C20
  4. D28

Correct answer

A. 13

Step-by-step solution

Two series alternate here, with every third number following a different pattern. In the main series, 3 is added to each number to arrive at the next. In the alternating series, 5 is subtracted from each number to arrive at the next.

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