Discussion
Find out the wrong number in the series 445, 221, 109, 46, 25, 11, 4
Answer: C
Each term is obtained by subtracting 3 and halving.
\[ \frac{445 - 3}{2} = 221 \quad\checkmark \qquad \frac{221 - 3}{2} = 109 \quad\checkmark \]
\[ \frac{109 - 3}{2} = 53 \quad\text{but the series shows } 46 \]
So 46 is wrong. The rest confirm 53: \( \tfrac{53-3}{2} = 25 \), \( \tfrac{25-3}{2} = 11 \), \( \tfrac{11-3}{2} = 4 \).
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