Selective Question

Which of the following completes the number sequence 4, 7, 11, 16,

  1. ×

    20

  2. ×

    21

  3. 22

  4. ×

    23

  5. ×

    24

Collected in the board: Arithmetic sequence

Steven Zheng Steven Zheng posted 2 weeks ago


Answer

  1. Calculate the difference between consecutive given terms

    7-4 = 3 \\ 11-7=4\\ 16-11=5

    We can find the series of the differences is an arithmetic sequence with a common difference 1. So the difference between the last given term and its next term is 6.

    The next term is 22. C is the choice.

Steven Zheng Steven Zheng posted 2 weeks ago

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