17, 17, 34, 20, 20, 31, 23, … choose which pair of numbers comes next?

26, 23
34, 20
23, 33
27, 28 E. 23, 28

The correct answer is $\boxed{\text{E}}$, 23, 28.

The sequence is a simple alternating repetition of two subsequences:

  • 17, 34
  • 20, 31

The first number in each subsequence is repeated, and the second

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number is increased by 7.

Therefore, the next pair of numbers is 23, 28.

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