Discussion
20, 19, 17, ?, 10, 5
Answer: D
Correct answer: 14
The series falls by one more each time: \( -1, -2, -3, -4, -5 \). From 17 the next step subtracts 3, giving \[ 17 - 3 = \mathbf{14} \] and then \( 14 - 4 = 10 \) and \( 10 - 5 = 5 \), as shown.
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