Discussion
1, 1, 2, 6, 24, ?, 720
Answer: D
Correct answer: 120
The terms are the factorials: \( 0!=1,\; 1!=1,\; 2!=2,\; 3!=6,\; 4!=24 \), so the missing one is \( 5! = \mathbf{120} \), followed by \( 6! = 720 \).
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