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Questions  >>  JEEMAIN and NEET  >>  Mathematics  >>  Class11  >>  Statistics
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Q)

If $ \sigma_x= \sigma_y$ and $x,y$ are related by $u=x+y\: v=x-y$ then $cov (u,v)$ is

$\begin {array} {1 1} (A)\;-1 & \quad (B)\;0 \\ (C)\;1 & \quad (D)\;cov\: (x,y) \end {array}$

 

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