A) \[-\frac{1}{2}\]
B) \[\frac{1}{2}\]
C) 1
D) \[-1\]
Correct Answer: C
Solution :
\[\left| (1+i)\frac{(2+i)}{(3+i)} \right|=|1+i|\left| \frac{2+i}{3+i} \right|=\frac{\sqrt{2}\times \sqrt{5}}{\sqrt{10}}=1\]
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