4-1.Complex numbers
easy

$n$ ની . . . ન્યૂનતમ ધન પુર્ણાક માટે ${\left( {\frac{{i - 1}}{{i + 1}}} \right)^n}$ એ વાસ્તવિક સંખ્યા મેળવો.

A

$2$

B

$3$

C

$4$

D

$5$

Solution

(a)${\left( {\frac{{i – 1}}{{i + 1}} \times \frac{{i – 1}}{{i – 1}}} \right)^n} = {\left( {\frac{{ – 2i}}{{ – 2}}} \right)^n} = {i^n}$
Hence, to make the real number the least positive integar is $2$.

Standard 11
Mathematics

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