Discussion
Find out the wrong number in the series. 3, 7, 15, 27, 63, 127, 255
Answer: C
Each term is double the previous plus one.
\[ 3 \to 7 \to 15 \to 31 \to 63 \to 127 \to 255 \]
The fourth term should be \( 15 \times 2 + 1 = 31 \), not 27.
So 27 is wrong. Every correct term is \( 2^{n} - 1 \), and 27 is not.
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