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please do it asap. answer will be appreciated.

15. If \( x_{1}=y_{1}+y_{2}, x_{2}=y_{2}+y_{3}, x_{3}=y_{3}+y_{1} \). where \( y_{1}, y_{2}, y_{3} \) are uncorrelated variables each of which has zero mean and unit standard deviation. find the mulriple (Kanpur M.Sc. 2001) arrelation coefficient \( x_{1} \) and the two variables \( x_{2}, x_{3} \)