Discussion
Find the next term: 3, 8, 18, 38, ?
Answer: C
Correct answer: 78
Each term is twice the previous term plus 2.
\[3 \times 2 + 2 = 8, \quad 8 \times 2 + 2 = 18, \quad 18 \times 2 + 2 = 38\]
So the next term is \(38 \times 2 + 2 = 78\).
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