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x(1),x(2)andx(3) are three variates with...

`x_(1),x_(2)andx_(3)` are three variates with means `bar(x_(1)), bar(x_(2)), bar(x_(3))` respectively, each variate occurring equal number of times and having correlation coefficients `r_(12)` between `x_(1)andx_(2)` etc. Then
`r_(12)+r_(23)+r_(13)ge-3//2`

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