Discussion
2, 7, 27, 107, 427, ?
Answer: B
Correct answer: 1707
Each term is four times the one before, less one: \( 4(2)-1=7 \), \( 4(7)-1=27 \), \( 4(27)-1=107 \), \( 4(107)-1=427 \), so \[ 4 \times 427 - 1 = \mathbf{1707} \]
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