Multiple choice

Choose the pair of the numbers which comes next in the given series: 17, 17, 34, 20, 20, 31, 23, ...

  1. 26, 23

  2. 34, 20

  3. 23, 33

  4. 27, 28

  5. 23, 28
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E Correct answer
Explanation

This is an alternating subtraction series with repetition. There are two different patterns here. In the first, a number repeats itself; then 3 is added to that number to arrive at the next number, which also repeats. This gives the series 17, 17, 20, 20, 23, and so on. Every third number follows a second pattern, in which 3 is subtracted from each number to arrive at the next: 34, 31, 28.

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