Discussion
5,6,9, 15, ?, 40
Answer: B
Correct answer: 25
The gaps are the triangular numbers: \( 6-5=1 \), \( 9-6=3 \), \( 15-9=6 \), so the next gap is 10, giving \[ 15 + 10 = \mathbf{25} \] and \( 25 + 15 = 40 \), as shown.
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