सम्मिश्र संख्या \(\rm 1 +i\over 2 + i\) का मापांक ज्ञात कीजिए। 

1
\(\frac{ \sqrt{12}}{5}\)
2
\(\frac{ \sqrt{10}}{5}\)
3
\(\frac{ \sqrt{3}}{5}\)
4
\(\frac{ \sqrt{10}}{3}\)

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