Discussion
15, 31, 63, 127, 255, --
Answer: B
Correct answer: 511
Each term is one less than a power of two: \( 2^4-1=15 \), \( 2^5-1=31 \), \( 2^6-1=63 \), \( 2^7-1=127 \), \( 2^8-1=255 \), so the next is \( 2^9-1 = \mathbf{511} \). Equivalently, each term is twice the one before, plus one.
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