\(\sqrt {{x^{ - 1}}y}  \times \sqrt {{y^{ - 1}}z}  \times \sqrt {{z^{ - 1\;}}x} \) এর সরলমান কত ? 

A  0 

B  1 

C  xyz 

D  \( \pm \) 1  

Solution

Correct Answer: Option B

√(x-1y).√(y-1z).√(z-1x)
=√(1/x.y)√(1/y.z)√(1/z.x)
=√(y/x).√(z/y).√(x/z)
=√{(y/z).(z/y).(x/z)}=√1=1

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