Problem

Which best describes this sequence? \( 3,6,12,18, \ldots \)

Answer

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Answer

3. Second difference is not constant, so the sequence is neither arithmetic nor geometric.

Steps

Step 1 ：1. Find differences: \(6-3=3, 12-6=6, 18-12=6\)

Step 2 ：2. Find second differences: \(6-3=3, 6-6=0\)

Step 3 ：3. Second difference is not constant, so the sequence is neither arithmetic nor geometric.

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