Discussion
6, 13, 25, 51, 101, ?
Answer: C
Correct answer: 203
Each term is twice the one before, with one added and subtracted by turns: \( 2(6)+1=13 \), \( 2(13)-1=25 \), \( 2(25)+1=51 \), \( 2(51)-1=101 \), so \[ 2(101)+1 = \mathbf{203} \]
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