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Select the correct answerLook at this series: 4, 7, 25, 10, __, 20, 16, 19, ... What number should fill the blank?radio_button_unchecked13radio_button_unchecked15radio_button_unchecked20radio_button_unchecked28

Question

Select the correct answerLook at this series: 4, 7, 25, 10, __, 20, 16, 19, ... What number should fill the blank?radio_button_unchecked13radio_button_unchecked15radio_button_unchecked20radio_button_unchecked28

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Solution

To solve this problem, we need to identify the pattern in the series.

The series is actually two alternating series:

  1. The first series starts with 4 and adds 3 each time (4, 7, 10, 13, 16, 19, ...).
  2. The second series starts with 25 and subtracts 5 each time (25, 20, 15, 10, 5, ...).

So, the missing number in the series is the next number in the second series, which is 15.

Therefore, the correct answer is 15.

This problem has been solved

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